my friend just got an eg hatch and bought a new master cylinder. He bled the brakes and about 5 days later they began to lock up by themselves. he doesnt even hit the brake pedal.

Anyone have any ideas? let me know if u need more info.TIA

 

Stuck calipers? Check the calipers, see if the brake pads are lower on one side of the car then the other.

 

We checked the calipers and pads they look to be in good shape. There is nothing but new fluid in the lines due to him having to bleed the brakes every where he goes.

 

Air in the fluid?

 

Why did he change the master in the first place?

How is the process being done?

What has been checked?

You got to get into detail if you want some help.

 

are the pads wedged in there tight???.. disc or drum in the rear?

 

What happened is he did a wire tuck and painted the engine bay before he swapped the K20 into the car. He took all the brake lines off the firewall to make it easier to paint then put them back on when done. I went to his house and bled the brakes and put all new fluid in. H e drove the car for about 5 days without any problems. Then they started to lock up. So he replaced the master cylinder to see it that was the problem, but no luck. When they lock up he stops the car and bleeds the brakes and they work fine for a short period of time then they lock up agian....


CAR HAS rear drum.

 

Had the same prob after replacing my MC.
Turns out the MC to pushrod clearance was insufficient.
I would check that and also the brake pedal free play.