Replaced the master cylinder bled brakes, good pedal when not running but goes to floor when started

20

Asked by Dec 27, 2013 at 08:02 PM about the 1995 Chevrolet C/K 1500 Cheyenne Extended Cab Stepside SB 4WD

Question type: Maintenance & Repair

Bleeding brakes on a 95 Silverado after I
replaced the master cylindar

5 Answers

56,855

Did you bleed the brakes with the engine off? -Jim

3 out of 3 people think this is helpful.
20

Yes, bled it with the engine off and had good pedal but when I started the truck my pedal instantly goes completely to the floor.

2 out of 2 people think this is helpful.
56,855

Assuming you blead the master cylinder off the truck first, then blead out the brake system (right rear, left rear, right front then lastly left front) I'd say you got unlucky and have a defective master cylinder. I work at NAPA and, unfortunately, it sometimes happens. HTH. - Jim

10

Im going on my third Master Cylinder. Autozone sells crap parts and I will not buy from them anymore. Im buying an AcDelco Master Cylinder ( That happens to be the same price as the cheap Fenco from Autozone) So under warranty im going to exchange them. Im doing this on a 98 chevy c1500 so I feel your pain. Ive had to change almost the entire brake system and im only at 148,000.

1 out of 1 people think this is helpful.
10

Brake booster, ABS SYSTEM!, brake lines (most of them) Two master Cylinders (Thus far), bled it several times. I still have a squishy petal but it stops. Next is rotors, and wheels bearings. Also I've changed both Calipers and wheels cylinder and turned the drums and changed shoes.

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