Question about 2003 Chevrolet Avalanche

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It is leaking between the power assist piston and the brake piston area where they are connected

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Buy a rebuilt one. They used to sell rebuild kits - doubt if they do anymore. It helps if you add the make and model when asking questions- not in this case.

Posted on Nov 09, 2012

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Hydraulic brakes stoped working after blown steering seel? Need help


If there's no pressure on your brake pedal it's due to a failure somewhere in the braking system. I can't see any connection between a steering problem and a braking problem.

Most cars have a split-circuit braking system. That is, the front left wheel is on the same line as the rear right wheel. The front right wheel is on the same line as the rear left wheel.

This is just a safety feature: If one brake line loses pressure, the other line still works and you retain 50% of your braking power.

check the level of your brake fluid. If the level has dropped it indicates a leak somewhere. Though be aware that it is possible NOT to lose brake fluid whilst having soft brakes..

Brake pressure is lost due to either a faulty brake master cylinder or a leak at one of the wheels.

Remove each tyre in turn and inspect the piston on the brake calliper. If there's slight wetness caused by brake fluid that indicates a seal (around the brake piston) has failed and is drawing in air.

There's no need to replace a calliper - overhaul kits are available.

The link below shows generic images of brake calliper pistons/seals:
brake calliper piston Google Search

Feb 08, 2017 | Cars & Trucks

1 Answer

My front brake is leaking the brake fluid and i whant to fix it my self


first where is it leaking from is it the banjo bolt that connects the hydraulic fulid line to the caliper or is it the bleeder bolt check those to see if lose.. or is it leaking from around the brake pads if so the seals around the piston or pistons depending on the caliper. if so new caliper or find a junkyard. you will have to bleed the brake line of air after swaping caliper i highly suggest getting a power bleeder for removing air out of the lines keep in mind that you have to keep the resavor full of brake fulid awhile power bleeding...!

Apr 19, 2013 | 1995 Nissan King Cab

3 Answers

Brake fluid leak on rear drum


If you have no evidence of leaking outside the drum, most likely your brake piston is leaking or the drive shaft seal is leaking. Pull off the drum and look for the piston which spreads the two brake pads normally situated at the top. Inspect for leaks. If the fluid is thin, it is most likely brake fluid. If it is heavier like oil and really stinks, it is gear oil from a leaking seal.

Sep 07, 2012 | Cars & Trucks

3 Answers

NO POWER STEERING AND NO BRAKES WE CHANGED P/S PUMP AND THE HYDRO BOOST NOW WHAT


The brakes and the Power Steering are two different systems and two different problems. The brake problem is going to be a caliper or master cylinder issue which maybe a Vacuum issue if the Power Booster hose is leaking or disconnected from the master cylinder. The power steering is going to be low fluid in the power steering pump, faulty power steering pump (Obvious if you were hearing a whine that got louder as you turned the wheels, or the Power assist piston that connects to the tie rods.

Mar 02, 2011 | 2000 GMC Sierra

1 Answer

On my 2004 Jetta 1,8T the brakes are starting to get hard. Taking s little more pressure on the brake pedal to stop the car. What could be causing this??? Thanks


The most likely cause is loss of power assistance to the braking system which means you will need to apply increased brake pressure to compensate for the loss of assistance.

The problem will be with the brake servo assist. It is possible there is a leak in the brake servo assist system, which reduces the vacuum, so you are not getting sufficient mechanical assistance when applying the brakes.

It is unwise to be driving the car with this condition. If you lose all power assistance to the brakes, which could easily occur with this fault, the pedal will become very hard, you will need to apply very high pedal pressure and the vehicle will be very difficult to stop. You need to take the car to a VW dealer for service or to a competent brake specialist in your area to inspect the system and rectify the fault.

VW did a recall on some earlier year models for a leaking brake servo and I understand the problem was a faulty vacuum hose which would fail and leak. I am not aware of any recall for this item on later models like your 2004 vehicle.

All the best.

Dec 03, 2010 | 1997 Volkswagen Jetta

1 Answer

Brake fluid is expelled from the top cover of master cylinder when brake pedal is depressed why?


Brake fluid from the Master Cylinder leaks if the Master Cylinder is leaking itself otherwise the leak is somewhere else, have some one check this out, it could be anywhere and you should have seen some drops on the floor by now.

Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.

You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.

Also, this article could help to check it: how-to-fix-a-brake-fluid-leak

I hope helps (remember to rate and comment this).

Oct 03, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

How to remove power booster 1998 chevrolet pickup


It should be bolted on. Depending on the model, things might look different, but a socket wrench set should be all that is required.
Maybe a pry bar.

Power Boosters Virtually all modern vehicles use a vacuum assisted power brake system to multiply the braking force and reduce pedal effort. Since vacuum is always available when the engine is operating, the system is simple and efficient. A vacuum diaphragm is located on the front of the master cylinder and assists the driver in applying the brakes, reducing both the effort and travel he must put into moving the brake pedal.
The vacuum diaphragm housing is normally connected to the intake manifold by a vacuum hose. A check valve is placed at the point where the hose enters the diaphragm housing, so that during periods of low manifold vacuum brakes assist will not be lost.
Depressing the brake pedal closes off the vacuum source and allows atmospheric pressure to enter on one side of the diaphragm. This causes the master cylinder pistons to move and apply the brakes. When the brake pedal is released, vacuum is applied to both sides of the diaphragm and springs return the diaphragm and master cylinder pistons to the released position.
If the vacuum supply fails, the brake pedal rod will contact the end of the master cylinder actuator rod and the system will apply the brakes without any power assistance. The driver will notice that much higher pedal effort is needed to stop the car and that the pedal feels harder than usual.

Jul 05, 2010 | 1998 Chevrolet K1500

2 Answers

Leak in brake hydraulic system in the tubes running from what I think is a valve cluster connected mater cylinder


Dear estallings1,

The best thing you can do with reguards to this problem is replace any leaking parts asap. The reason for this in not only wil it let in air to the system and do more dammage in other areas but brake fluid is also hydroscopic. This means that the longer it is in contact with air the more moisture it will absorb causing the boiling point of the fluid to lower. When the boiling point lowers and the fluid comes into contact with a hot surface eg. calliper piston, it will vaporise and you may lose a whole section of your braking curcuit.

Therefore you need to replace all leaking parts and flush new brake fluid through the lines, also taking care to bleed. Once you have completed this the brakes will be as good as new.

If you are unfamiliar with working with brakes it would be a good idea to gain assistance from a mechanic as it is a job that usualy requires a certain level of knowledge of bleeding processes etc.

Reguards Luke.

Feb 12, 2010 | 2000 Chevrolet S-10

1 Answer

94 s10 chevy 2wd brake pedal fades to floor before stoping


Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes).
...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.

Aug 08, 2009 | 1994 Chevrolet S-10

3 Answers

Brake fluid leaking out the back left tire area


you a have blown wheel cylinder replace it and the brake shoes bleed the system and your good to go

Jun 29, 2009 | 2001 Nissan Altima

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