Question about 2003 Chevrolet TrailBlazer
If the vehicle only surges when braking sounds like you have a brake pulsation. If the brakes have become overheated like when driving down a mountain this can warp the brake rotors. They will need to be machined or replaced.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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Pumps when you Brake? Do you mean you have to pump it to
get it to brake or it surges the brake pedal? When the rotor was changed, most likely you had to compress the Caliper to get it on and may have changed the pads while you were there. If that is the case then sometimes the seals in the Caliper will roll instead of sliding back properly. If this is the case and you have to pump the brakes because they are spongey then you will need to replace the caliper. If the brake pedal is surging when you apply the brake (which would also be felt in the steering wheel then the new rotor was either incorrectly installed or is warped.
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