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brakes staying on

2808 Views 7 Replies 4 Participants Last post by  grizzly
Replaced the front and rear brake pads in my 2002 transporter. Everything went fine until I test drove it. The brake pedal is very high and hard and the brakes are dragging. Any ideas?
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Did you touch the fluid at all? Not sure why the brake pedal would be that high since there are stops. Try opening the brake fluid reservoir and see if fluid is at the right level. The hard brakes could be a vacuum issue.
Didn't do anything to the brake fluid other than forcing the fluid back to the resevoir when the pistons in the calipers were pressed back. It's like the master cylinder piston is not returning all the way back causing the brakes to stay on. Could pressing the pistons back cause the master cylinder to go bad. Never ran into this problem after a pad replacement but I guess the fluid must travel through the master cylinder before it get to the resevoir.
Not a fluid problem.

Did you rotate the rear caliper piston when you pushed it in? The front calipers can be pushed in but the rears need to be turned as they are pushed in. There's a ratcheting adjuster inside. After you do a brake job, pump the brakes 3 times and pull the e-brake handle 3 times. My guess: the e-brake is engaged and is causing the rear brakes to drag.

When you do a brake job and push the brake pedal all the way down to the floor, it might wear the seal a little since the pedal never goes that far into the cylinder. I doubt this caused any problem and 99% of the time it does not. If the seal was bad, the pedal would sink to the floor, not be high.
I did rotate the rear caliper pistons when I pushed them back. I also thought maybe the rear brakes where dragging so I loosened the e brake cable adjustment. I drove again and found all four brakes were very hot and dragging. So I loosened brake lines at the master cylinder, pumped the pedal to the floor once and this freed up the brakes so I could drive home. Now the brake pedal is very low but brakes are not dragging. Tomorrow I will bleed the brakes and recheck all pads and caliper pistons. How much do you have to rotate the rear pistons?
The threads on the tool will rotate the pistons.

You definitely have air or some fluid problem now. If you find that there are no brakes, pump the pedal to build up pressure. If you're not sure what you're doing, take it to a pro since the brakes are not something that you want to mess up.
Did a brake fluid renewal and brakes returned to normal. I believe when I pushed the pistons back in the calipers I must have disrupted the master cylinder to cause all four brakes to stay on. Bleeding the brakes repaired whatever was going on inside of the master cylinder. Only GOD knows for
sure. Thanks for your input.
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