locked up brakes for no reason - Pontiac G6 Forum
 
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post #1 of 3 (permalink) Old 11-01-2011, 07:20 PM Thread Starter
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locked up brakes for no reason

o5 g6 (used0 purchased 3 mo. ago)
while drive at normal speeds. mostly city drivinge the brakes just the front) suddendly are locked up. this is happenig while driving. smoking hot. i'm not touching the brake pedal. had it tow into the local dealer where i purchased it. by then the brake were unlocked (aprox. 30 min.)
this has happened (3) times in the last 70 days. the dealer says he can't fix whats not broken. i think it's the master cylinder? or an ABS problem??? HELP
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post #2 of 3 (permalink) Old 11-06-2011, 06:22 AM
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Welcome.....

What color is your brake fluid? Its suppossed to be clear (like water).

It prolly looks like pepsi right?

You have air/water in your line.

You need to change out your fluid and rebleed all four lines.

Do it ASAP before you damage your rotors/pads.

When it overheats like that the fluid actually boils in the line. That in turn releases air
thus causing even more issues.

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post #3 of 3 (permalink) Old 11-06-2011, 02:29 PM
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Quote:
Originally Posted by railmut View Post
o5 g6 (used0 purchased 3 mo. ago)
while drive at normal speeds. mostly city drivinge the brakes just the front) suddendly are locked up. this is happenig while driving. smoking hot. i'm not touching the brake pedal. had it tow into the local dealer where i purchased it. by then the brake were unlocked (aprox. 30 min.)
this has happened (3) times in the last 70 days. the dealer says he can't fix whats not broken. i think it's the master cylinder? or an ABS problem??? HELP
The table formatting is lost in the posting but you still get the idea:
__________________________________________________ _____

Brake System Slow Release
Step
Action
Yes
No

DEFINITION: Brake system releases and returns to rest slowly; vehicle motion is hindered by brake system briefly after release of brake pedal.

1
Were you sent here from the Hydraulic Brake Symptom table?
Go to Step 2
Go to Symptoms - Hydraulic Brakes

2
Inspect the hydraulic brake system for the following conditions:
• Improper operation of caliper pistons

• Internally damaged flexible brake hoses; hindering brake release

• Contaminated brake fluid

• Damaged or improperly operating master cylinder

Adjust, repair or replace components as necessary. Refer to Hydraulic Brake System Diagnosis.
Did you find and correct a condition?
Go to Step 5
Go to Step 3

3
Inspect the brake assist system for the following conditions:
• Binding, bent or damaged pedal pushrod, pedal, or pedal bracket

• Damaged or improperly operating vacuum booster, if equipped

• Restricted return hose from hydraulic booster, if equipped

• Damaged or improperly operating hydraulic booster, if equipped

Adjust, repair or replace components as necessary. Refer to Brake Assist System Diagnosis.
Did you find and correct a condition?
Go to Step 5
Go to Step 4

4
Inspect the disc brake system for the following conditions:
• Damaged or excessively worn caliper hardware and/or lining hardware

• Distorted or damaged linings

• Lack of lubrication or excessive corrosion on metal to metal contact surfaces

• Bent or damaged caliper or mounting component

Adjust, repair or replace components as necessary. Refer to Disc Brake System Diagnosis.
Did you find and correct a condition?
Go to Step 5
Go to Symptoms - Hydraulic Brakes

5
Install or connect components that were removed or disconnected during diagnosis.
Road test the vehicle in order to confirm proper operation. Refer to Brake System Vehicle Road Test.
Is the condition still present?
Go to Step 2
System OK



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