Question about 2005 Chevrolet Astro

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Have a single caliper that locks up. It receives pressure from the system, but doesn't release it back after letting off of the pedal. Have replaced twice thinking it was a bad mill on the piston.....not the case. CAN the ABS actuator be bypassed and just feed the lines from the master (hydraulically assisted by the power steering pump). It acts like there's a pressure valve in the ABS box that isn't releasing. Any and ALL help is greatly appreciated!

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Your break line is 2 ply, the inner lining is broken and acting as a check valve.

Posted on Jul 30, 2009

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You have a bad master cylinder. if abs goes bad it reverts to stock brakes.

Posted on Jul 29, 2009


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2 Answers

How do i disable r/r caliper on 2004 expedition

The only way to disable a rear brake caliper that is seized is to get a small pry bar and use force to slide it back to the release the pry bar in. The open space top of the caliper
25451082-az15v3devurpko3w4b520lul-5-0.jpg Then if I were in this situation since you come this far I would simply replace the caliper the slide bolts are 7mm Allen type.
then remove the brake fluid feed line don't forget to replace the
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then bleed the system do this by opening the air bleed
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Good to you!

Feb 19, 2015 | 2004 Ford Expedition

1 Answer

1988 Lincoln town car front brake calipers lock up have replaced both calipers. It drives perfect for awhile then they will lock up again.

When you replaced the calipers, did you also replace the caliper frame and slides? Start there. It is common in ford disk brakes to get "stuck" slide pins as they can rust inside the caliper causing the brakes to fail to release the rotor when you let off the pedal. Another cause is the flex line that connects the caliper to the metal lines at the body. As it ages, the inside of the rubber breaks down and collapses effectively becoming a check valve. Pedal force pushes fluid to the brake but separator spring pressure is not enough to make the fluid go back into the master cylinder effectively making the brakes lock up and bind. Try replacing slide pins if haven't already and replace the flex line.

Dec 05, 2014 | 1998 Lincoln Town Car

1 Answer

Calipers keep locking down

are you serious ? this should not happen , it tells me your master cylinder is @ fault , too much pressure, unbalanced system, not enough pressure to rear drums, bleed improperly, if you have abs brakes which I 'm sure you do, maybe the proportioning valve is stuck, should be in a balanced position. if bleeding does not help to resolve this, then replace the valve, rebleed the entire system, according to spec, back to front, LR,RR,RF,LF. UNLESS YOURS IS DIFFERANT. if you also suspect master cylinder, replace it also. but the VALVE needs to be replaced no matter what !

Mar 07, 2013 | 2005 Chevrolet Silverado

1 Answer

The left rear wheel is locked up

This can be caused by a defective anti lock brake system ABS for short, this year has active ABS, this means the system can apply hydraulic pressure to the brakes with the driver never touching the brake pedal, if the valve that controls this pressure to the wheel leaks or sticks the brakes will lock up. To confirm this release pressure at the wheel by opening the brake caliper bleeder valve at the top of the brake caliper with the engine off. If the wheel spins free after the pressure is released you will need the ABS checked and quite possibly a new ABS hydraulic control unit. This type of failure is very rare but it does happen

Jan 16, 2012 | 2003 Dodge Caravan

1 Answer

I have an 2004 Alero and I have to replace brakes every 3 months. What is going on?

you need to have the brake hydraulic system checked for the calipers sticking if you have 4 wheel disc brakes as they can seize on the sliding mechanism causing the brakes not to fully release.also if the caliper pistons are sticking in the calipers this will cause the same problem.make sure you or anyone else that drives your car doesn`t drive with 2 feet as just slight pressure from resting your foot on the brake pedal can cause pressure in the system applying the brakes enough to wear them prematurely but not put the brake lights parts also will cause excessive wear.

May 25, 2011 | 2004 Oldsmobile Alero

2 Answers

I have a 86 lincoln mark vii and i have a problem with the right front brake the caliper doesnt want to relase after the brake pedal is released and heats up and smokes piston still moves back and forth...

replace the brake hose they get what is called a fissure inside hose and it will act like a check valve you hit brake pedal and when you let off brake pedal the fissure inside hose will hold pressure on caliper i see it all the time next time it locks up open the bleeder screw on caliper and the wheel will free up because you release the pressure that can,t go thru hose

Sep 03, 2010 | 1986 Lincoln Mark VII

4 Answers

Front brakes sticking after a couple of miles

There are 2 causes, 1.caliper slides are in need of servicing/lube.2, caliper(s) piston(s) need to be serviced/cleaned. Recommend replacement of both calipers, if either doesn't work.

May 15, 2010 | Cars & Trucks

1 Answer

2004 chevy colorado...100,000 miles. The brakes are fine when you first begin to drive, but after 10-15 minutes, both front wheels begin to brake. They have not locked up, but have a lot of resistance. I...

A kink in a hardline would result in a pair of them getting locked up, but not all 4. The kink allows pressure from the master cylinder through to the calipers, but won't allow it to release back to the master cylinder though in your case maybe it is allowing some pressure back which is why they aren't fully locking up. The result is that with each pump of the pedal you are locking more and more pressure into your calipers until they lock up. Opening the bleeder screw releases this pressure, then it starts all over again. So this would be the first thing to look into.

Let me know how this works out for you.


Jan 01, 2010 | Chevrolet Colorado Cars & Trucks

2 Answers

Front brakes dragging

First of all you will need to raise the wheels off the ground. Check both sides to see if they are both holding. Here is a list of what can cause the hanging in order of probablility;

1) Caliper or Caliper hose. (If the caliper is not free it won't release the pressure from the pad. Always replace the hose with the caliper because the hose may look good, but can collapse internally holding the pressure.

2) Master cylinder. Not likely but possible.

3) ABS is engaging. This can be caused by a short, it is rare, but it does happen. The short is telling the system that the wheel needs to be applied.

Aug 28, 2009 | 1997 Oldsmobile Bravada

3 Answers

Left rear brake caliper locks up

did you aply copper grease on slidingpad of the caliper dirt can get between there the caliper will not retrackt from the disk make sure caliper moves and try again

Jul 30, 2009 | 2002 Dodge Stratus

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