why do both front btrake cslipers lock up at the same time?

Asked by Apr 10, 2012 at 01:49 AM about the 1997 Toyota 4Runner 4 Dr SR5 SUV

Question type: Maintenance & Repair

it has 4wheel abs. If i open either front caliper bleeder screw both wheels free up. Also when brakes lock up the brake pedal height is high. checked brake hoses seem to be ok. I am thinking master cylinder or absactuator. problem is intermittent

1 Answer

12,285

Some possibilities I see are 1. Collapsed hoses to calipers. 2. Debris in valve or actuators. Does the brake peddle feel normal like before the problem arose? Is the fluid in the reservoir dark? One simple thing you can try is to flush out the brakes system. Follow the procedure to bleed brakes and flush some new fluid through the system to dislodge any foreign matter. It is possible that you have both flexible lines to the calipers collapsed. This in effect acts as a check valve on both calipers.

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