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Old 04-10-2020, 11:07 AM   #1
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Brake Issue

So a little history 2000 Boxster S brakes are about three years replaced rotors and pads .I do a brake flush every year.
Driving home from work a couple of weeks ago the rear brakes develop some issue . I'm on the free way doing 80 ish within a few miles I pull off because I feel the cars brakes dragging . Both rotors are blue they got so hot the brakes were locked up. I get the car home and try to bleed some fluid off .No way I cant get any fluid through the system by pressing the brake peddle. I have replace both rear calipers and rotors and pads .Put in a new master cylinder .Vacuum bleed the system at all 4 corners . I go for a test drive and passenger rear rotor is noticeably hotter than driver side .Assume I got a bad caliper .exchange it for another do another bleed and same issue . I have checked the parking brake and its not the problem .S.O.S. Cant afford to take to dealer. I'm at a loss and would really appreciate some of your thoughts as to what the problem could be .Thank you guys .JEFFPA What do you think?


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Old 04-10-2020, 12:34 PM   #2
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Gabe, I am not an expert by any means but ran into a similar situation many years ago.., where the rear calipers were locking up after the brake fluid expanded by heat.

Because after replacing the master cylinder, I over adjusted the pedal travel and the solution was to loose a bit the adjustment between the pedal and the master cylinder (allowing a bit of extra play on the pedal).

Something to check anyway, Good Luck!
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Old 04-10-2020, 12:46 PM   #3
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When was the last time the rubber lines we changed? As they age they have a tendency to swell and restrict flow.
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Old 04-10-2020, 02:55 PM   #4
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I have not replaced the rubber lines .But today did buy some stainless lines from Pellicans they will be here next week . Really hope that's the problem as I am baffled by this .
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Old 04-10-2020, 04:42 PM   #5
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Have the front wheel bearings been changed recently? The ABS system have any fault codes? Have you checked that the wheel speed sensors are clean and in place, wiring good? If the ABS gets incorrect wheel speed data from the front wheels it will apply rear brakes to attempt to control wheel speed difference.
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Old 04-10-2020, 07:52 PM   #6
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2ooo boxster s No traction control . No abs codes .Looks like theirs is only one hydraulic line from the ABS pump to a Tee on driver side rear .Both rear brakes controlled from one line .If it is an ABS should it not cause both rear calipers to stick?
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Old 04-10-2020, 08:21 PM   #7
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Quote:
Originally Posted by gabedrummin View Post
So a little history 2000 Boxster S brakes are about three years replaced rotors and pads .I do a brake flush every year.
Driving home from work a couple of weeks ago the rear brakes develop some issue . I'm on the free way doing 80 ish within a few miles I pull off because I feel the cars brakes dragging . Both rotors are blue they got so hot the brakes were locked up. I get the car home and try to bleed some fluid off .
Just going by the info you posted above in red. Traction control is not necessary for ABS to control wheel lock up. The 2000 has 3 channel ABS, so yes only one brake line to rear.
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Old 04-17-2020, 12:34 PM   #8
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What tire sizes are you running front and rear?
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Old 04-22-2020, 06:14 PM   #9
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with everything you've done trying to sort out the problem, it would be cheaper just to take it to a shop for repair. you don't need to pay dealership rates; there's lots of independent shops in Houston

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