my brakes lock up?

2005 GMC SIERRA
180,000 MILES
Avatar
BGS1
  • MEMBER
  • 3 POSTS
after i drive for a about 10 miles and the truck warms up the brakes start to lock. It feels like i have my foot on the brakes. When i stop and the truck cools down it drives fine until it warms up again
Mar 25, 2012 at 12:46 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
BILLYMAC
  • CAR REPAIR CONTRIBUTOR
  • 2,204 POSTS
This happens when the brake booster push rod is adjusted out too far which does no allow the brake master to return fully holding the brakes on . To confirm the issue loosen the brake master mounting bolts 3 turns to see if the car starts to roll again, if so remove the master and adjust the booster push rod inward. Also a brake flex hose can come apart internally causing a short of check valve in the system but this is usually isolated to one brake either front or rear.

May 8, 2021 at 12:55 PM
Advertisement
Avatar
GEEGEE
  • MEMBER
  • 1 POST
I had to replace the brake booster because the adjusting rod was seized.
May 8, 2021 at 12:55 PM