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1994 cheverolet suburban 5.7 power steering hosesing hoses
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By Dorman Products
Steering and Suspension Knuckles | Counterperson Training from Dorman Training Center
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By Counterman
Brake master cylinders convert the force exerted on the brake pedal into hydraulic force that is transmitted to the individual brake hydraulic cylinders located at each wheel. Their basic operation is easy to understand, but before getting into that, let’s look at how impressive the brake system actually is.
Have you ever tried to stop a car that rolls unexpectedly down an incline, even an incredibly slight one? It’s not easy. As a matter of fact, most of the time, you just get out of the way and hope it doesn’t hit anything before it stops. Cars are heavy. We’re not strong enough to stop them, even with all our might.
So how is it we’re able to stop them with one foot and the brake pedal? It’s not because we’re that strong. It’s because of hydraulics, the basis for brake-system operation. The theory of hydraulics states that the pressure exerted anywhere on an enclosed liquid is transmitted equally in all directions.
A visual representation can make it easier to understand. Figure 1 shows a cylinder with a piston that has a surface area of 1 square inch. Five pounds of force are being exerted on the end of the piston, which creates 5 pounds per square inch (psi) of pressure inside the system. Since liquid doesn’t compress, that pressure is transmitted equally to all interior surfaces of the cylinder.
link hidden, please login to view That same 5 psi travels through the line into the larger cylinder that has a piston with a surface area of 10 square inches. Since the pressure is transmitted equally to all surfaces, 5 psi is being applied to each square inch of the larger piston, and multiplying the pressure by the area gives the output of the larger piston. This is what allows master cylinders to be relatively small, yet a brake system to be so powerful.
How Do They Work?
The primary parts of any master cylinder are the reservoir, the body and the piston(s). The reservoir can be made of cast iron, aluminum or plastic; the bodies will be cast iron or aluminum. Cast-iron or aluminum reservoirs are usually cast together with the body of the master cylinder, making them appear as one single piece. This is the original type of master cylinder on most “classic” cars.
When plastic reservoirs are used, they typically sit directly on top of the master cylinder, but they also can be mounted remotely if there’s no room, with a hose leading to the master cylinder.
The piston is located in a bore within the body of the master cylinder, and when the brake pedal is depressed, the force on the piston pressurizes the brake fluid and pushes it through the lines. A series of valves and ports further controls the flow and return of the fluid inside the master cylinder.
link hidden, please login to view For many years, master cylinders were of the single-piston type, meaning only one piston pushed the fluid to all four wheels. The problem with this design was if there was a pressure loss anywhere in the system, there was a complete loss of brakes.
By the late 1960s, dual-piston master cylinders were mandatory on all new cars. A dual-piston master cylinder has two separate braking circuits, which can be split diagonally or front to rear, but either way, the important factor is you can still stop the car with a pressure loss on one circuit.
Whether it’s a diagonal or front-to-rear split depends on the vehicle. For example, a front-to-rear split is acceptable on vehicles with an even front-to-rear weight division, but when most of the vehicle weight is in front – such as on a front-wheel-drive vehicle – the system is split diagonally, since the rear brakes alone wouldn’t be enough to stop the vehicle.
Maintenance
One school of thought says there’s no actual maintenance on the master cylinder, and this is loosely correct. However, regularly flushing the brake fluid is routine maintenance that not only maintains proper braking, but also will extend the life of all brake components, including the master cylinder. Due to the corrosive nature of brake fluid – which gets worse the older it gets and the greater amount of moisture it absorbs – the seals, valves, piston and bore inside a master cylinder are easily damaged by dirty fluid.
Signs of Trouble
There are some telltale signs of a failing master cylinder. The first one is a slow fluid loss with no outwardly visible leak. The only possible location for an external leak is at the rear of the bore, where the pistons slide in during assembly. It’s often hard to see a leak, since the fluid leaks out the back into the brake booster or inside the vehicle when the master cylinder is mounted to the firewall. If there is regular fluid loss but no external leaks can be seen, look closely at this area.
Brake fluid damages paint, and a close inspection usually shows softened paint around the mounting ears of the master cylinder, indicating a leak. In some cases, you may have to unbolt the master cylinder to inspect it for leaks. Occasionally, the seals between the reservoir and master cylinder can leak as well, but these are usually available separately.
If the brake pedal slowly sinks to the floor when you’re pressing on it, this indicates fluid is leaking internally past the piston seals and the master cylinder must be replaced. Eventually, this will lead to complete failure of the master cylinder, resulting in a pedal that goes completely to the floor and no brakes.
If a brake system experiences a sudden loss of braking force and the pedal goes to the floor, this generally indicates a broken brake line or hose, which also will be evident by rapid loss of fluid. Master cylinders themselves rarely exhibit sudden failure. They almost always give warning in the way of slow leaks or slow leak-down of the brake pedal, which means it’s time to replace.
Replacement
When your customer is installing a new master cylinder, they’ll need brake fluid first and foremost, and they may ultimately need a lot more when they go to bleed the system if they find bleeder screws that won’t open.
However, the most important advice you can give them is to bench-bleed the master cylinder following the instructions and using the bleeding hardware that comes with it. You can assure them it’s a simple and quick process, but a potential nightmare if they don’t. This is also one of the most important times to use a fender cover. Even the slightest drop of brake fluid on the paint will begin to etch into it immediately, and it’s a quick and easy way to avoid it.
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By Counterman
Bryan Miller, vice president of product and category management at Arnold Motor Supply, has been elected chairman of the Alliance Commercial Vehicle and Heavy Duty (CVHD) steering committee for 2024.
The CVHD steering committee is a collection of Alliance CVHD membership with the purpose of providing guidance on vendor relationships, exclusive national branding and the developing national truck service program.
The Alliance CVHD program prides itself on industry-leading IT solutions to facilitate ease of business; expansive interchange and product lookups; B2B and B2C solutions; and ensuring truck-part suppliers and repair facilities are found online. The Alliance CVHD steering committee will offer guidance and new ideas that will steer the future of the program.
Miller will begin serving as chairman of the Alliance CVHD steering committee effective Jan. 1.
“This is a great opportunity for myself and the Alliance as a whole,” Miller said. “To be a part of something from the beginning is a privilege. The Alliance CVHD team has done a great job of starting this program and we at Arnold Motor Supply look forward to being a part of its growth and future success. We are just getting started, our goal is to make this the strongest CVHD program in the industry.”
Miller will work directly with other members of the steering committee, as well as the Alliance CVHD headquarters personnel led by Justin Hebert and Mario Gonzalez.
“We are delighted to have Bryan Miller taking the helm as chairman of the CVHD steering committee,” said Mario Gonzalez, Alliance CVHD program manager. “Bryan’s incredible success in growing the heavy-duty business at Arnold Motor Supply speaks volumes about his expertise. What sets Bryan apart is not just his professional achievements, but his genuine commitment to the Alliance’s CVHD program. His eagerness to share ideas, showcases a leader who not only believes in growth but actively nurtures it. With Bryan steering our committee, we are confident in the continued success of our CVHD program.”
Those interested in more information or specific program details and membership should contact Mario Gonzalez at [email protected] or visit
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By Counterman
Rack-and-pinion steering is the predominant type of steering system on vehicles today.
Simplicity is one of the reasons for their popularity. On these systems, an inner and outer tie-rod end on each side connects the steering rack to the steering knuckle. The inner tie-rod ends tend to last longer than the outers because they have a smaller range of motion, and they simply don’t get the same abuse as the outers on these systems.
Throughout the life of a vehicle with rack-and-pinion steering, it’s not uncommon to replace outer tie-rod ends multiple times, and rarely or never replace the inners – as long as the boot (also known as bellows) that protects them from dirt and moisture isn’t damaged.
Before rack-and-pinion steering became popular, a parallelogram steering linkage was the predominant setup on most cars and trucks, consisting of a pitman arm, idler arm, center link and inner and outer tie-rod ends on each side. The tie rods are connected by a tie-rod sleeve. Even after rack-and-pinion systems became popular and virtually standard on all cars, parallelogram steering remained in use on trucks, vans and heavy-duty vehicles for many years, but today rack-and-pinion is becoming more common on them too.
There’s another type of steering system you may run across, also common on some trucks and heavy-duty vehicles, and it consists of a drag link and tie rods. The difference is there’s no idler arm. A drag link goes from the pitman arm to a tie rod that connects to the steering knuckle, and second tie rod runs from the first to the other steering knuckle.
Terminology can vary, but don’t let that throw you. In this illustration, No. 4 is the drag link, No. 2 and No. 1 are tie rods. Some people may refer to the drag link as an inner and outer tie rod. Also note No. 6, a steering damper, is a common feature on heavy-duty vehicles.
When selling steering components, it can be useful to look at a diagram, in case your customer is unsure of the name of the component they need. You also can use it as an aid in pointing out additional items they may need.
The Quality Question
It’s not uncommon to be asked about quality, especially with the different lines and varying cost of the steering components you sell. The “economy” or “value” line is designed to make it affordable to repair a vehicle. There’s nothing wrong with these components. I’ve used them many times, and they’re as safe as any other. Will they last as long? Most likely not, but many people choose to go this way because it’s simply all they can afford, and we all can respect that.
On heavy-duty or vehicles that the owner plans to keep long-term, it’s best to recommend a higher-end line of components. They’ll last longer, and you also can remind your customer that every time you replace a steering component, an alignment must be performed. That’s an additional cost, and worn components also will cause abnormal tire wear. A less expensive component that doesn’t last as long actually might cost more in the long run.
Where’s the Grease Fitting?
Fewer steering components come with grease fittings than in the past. Many people perceive this as a sign of “cheap” or low quality. This is far from the case. Many high-quality steering components today are constructed with better materials and higher-quality lubricants. Lack of a grease fitting doesn’t mean low quality. But it does mean there’s no way a poor-quality lubricant can be added to the joint, it can’t be over-greased, and there’s no way for moisture or contaminants to find their way in either.
Here’s the kicker: Is your customer going to personally grease the fittings themselves? As a professional technician, if I had a nickel for every greaseable joint I’ve seen that was completely worn out, with not even a remote sign of grease ever having touched the zerk fitting … you know the rest. This is reality. Blame it on whomever. If the greaseable joints aren’t going to be greased, I’d rather have those not designed for it.
Extras
There are a few good suggestions to keep in mind when selling steering components. If it’s a rack-and-pinion vehicle, rack boots are a good suggestion since the outer tie-rod ends must be removed to replace them. On parallelogram steering, when tie rods are replaced, tie-rod adjusting sleeves are a huge benefit. These are almost always rusted in place and difficult to loosen and turn. New sleeves make the installation much quicker, as well as the alignment. If the vehicle has a steering damper, it’s always a great recommendation. These tend to get ignored, but are commonly worn out. And finally, don’t forget grease for the grease gun, and shop rags to clean up the mess.
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