1997 GMC Sierra lock up

GJETTE

MEMBER
1997 GMC SIERRA
V8
4WD
AUTOMATIC
140,000 MILES

Hello, iam new to the site, and must say very impressed with the service you provide for people.

when it has rained out or there is alot of moisture in the air the right rear drum brake lockes up the minute you apply any type of brake, and skreeches. You have to pick up a little speed and apply the brakes to get it to free up. Then its fully operational at that point on. There is no pulling or repeat while you drive. Just the first start and go. What does this sound like to you?
thank you for your attention.
garrett from nashua nh.

4 Replies

MERLIN2021

MECHANIC
17,250 POSTS

The first thing we need to know is which rear brakes you have, disc or drum?

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Sunday, March 15th, 2009 AT 8:26 AM

GJETTE

MEMBER
2 POSTS

They are 11 inch drum brakes.

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Sunday, March 15th, 2009 AT 2:12 PM

MERLIN2021

MECHANIC
17,250 POSTS

Has any recent work been done to the brakes or axles? If not remove the drum, inspect the wheel cylender, push the pistons in, do they move freely? Any leaks under the dust boots? I use a pick to inspect inside the boots, if they are OK next check the shoes, is the larger shoe at the back? All springs and hold downs in place? Next, is the axle seal leaking any rear end oil into the drum? Last chaek parking brake cable, is it frozen? Then adjust rear brakes until a slight drag is felt.

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Monday, March 16th, 2009 AT 2:07 PM

GJETTE