Silverado brakes locking up.

[spackelman]

What a horror story.

Its seems somebody has to get killed to get satisfaction.

If you drove the truck thru their showroom window.....

Maybe if you could dig up a little dirt on the dealership, since your in the business. Make them sweat a little.

[Capt. Delta]

Haven't given an update on the brakes in a long time cause was still trying to figure out what the hell was wrong. First off you were right Sonny. Gavin at Modulemaster was awesome. Must have talked to him 8 or 9 times and he always went step by step through the troubleshooting. At one point he even shipped me his back-up ABS scan tool to do some tests at no charge.

Now for the solution. Got the rebuilt ABS back and still had the problem with brake lock-up. Gaven said it had one bad solenoid but should not have caused lock-up. I ran it for awhile with the fuse out cause I was just getting too frustrated to work on it anymore. I did notice even with the fuse out there was a little shudder at high speeds but not near as severe as when the fuse was in.

One morning I raised the front tires while truck was cold. Wheels turned freely. Started the engine and pumped the brakes a few times. Now the wheel would turn but took both hands just to turn it. I then loosened the two nuts that hold the master cylinder to the power booster. Sure as hell the brakes released. Only had to back them off about a 1/16th of an inch. Noticed there was no gasket between the m/cylinder and power booster. Checked the Chilton manual which said there should be one. Went back to the dealer to "discuss" why their mechanics forgot to put in the gasket. According to their shop manuals there is no gasket used. They called Detroit who said there was one known instance of a booster piston being machined too long but since I had replaced the booster from a parts house when all my problems started there was nothing they could do.

So I wound up making a new gasket out of 1/16" material and sure as hell my brakes are working perfectly.

A years worth of frustration all because of a damn gasket.

[intel_guy]

What a bunch of crap. The dealer owes you service to correct the problem completely.

If you end up doing the job yourself, try this guy. I've gotten great products from them. Good prices too. Search ebay for silverado hub. he has other zero mile parts as well.
http://cgi.ebay.com/ebaymotors/Zero-...spagenameZWDVW

Or this guy has an exact application:
http://cgi.ebay.com/ebaymotors/Front...spagenameZWDVW

[Blue Bowtie]

Captain,

Good to see that you've resolved the problem. If you want to pursue it further, visit a different dedalership parts counter, and ask to look at the parts breakdown for the power booster and master cylinder on your truck. The diagram should show whether a gasket is installed there or not.

[jackg52]

Am having the same problem. I have replaced the power booster (2 times) master cylinder all the brakes pads. When it locks up all the wheels stop. It slides the tires. I get out and release the pressure at the master cylinder and am good to go for a day or so. I put a gasket between the power booster and master cylinder and it does the same thing.it is a 99 chevy 2500 pickup. Is there a posability that the power stearin
g pump or hoses to the hoses to the power booster (hydrochloride booster ) might be bad.

[j cAT]

Originally Posted by jackg52

Am having the same problem. I have replaced the power booster (2 times) master cylinder all the brakes pads. When it locks up all the wheels stop. It slides the tires. I get out and release the pressure at the master cylinder and am good to go for a day or so. I put a gasket between the power booster and master cylinder and it does the same thing.it is a 99 chevy 2500 pickup. Is there a posability that the power stearin
g pump or hoses to the hoses to the power booster (hydrochloride booster ) might be bad.

how long you owned this ?

what can happen is if the fluid is contaminated then the master will swell up and stick in the apply position. remove master and check that this is not occuring. only use new brake fluid. any mineral oil in the brake fluid will do this even just a drop...