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Rear brake pressure sw - 164 140-160 1975

Little history:
When I picked up this car, the PO said that brake fluid is leaking somewhere around the back. It was unsafe to drive. So I towed it to a shop, where a new master cylinder and two reconditioned rear calipers were installed.
When I drove it home, the brake pedal would slowly go to the floor at traffic lights. The right rear (I think) squealed like a stuck pig. Found that the brake fluid leaked at both rear calipers at the line fitting, and the left rear pads never touched the rotor.

Problem:
Back to the same shop to finish job not done right. Mechanic thinks the brake valve in the back is not working properly. My argument is that if the valve doesn't work, then the rear calipers should default to full pressure. Yes?

Besides, if the brake valve is holding back pressure, then why are the lines leaking where they connect to the calipers? This is a reputable shop, but I think I will not go back.

Klaus
--
98 V70Rawd(108Kmi), 95 854T(88K mi), 75 164E(173K mi)






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