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


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

Question type: Maintenance & Repair

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

6 Answers


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

4 people found this helpful.

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 people found this helpful.

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


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 people found this helpful.

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.

1 people found this helpful.

The 98 Chevy pickup truck with anti-lock brakes needs to have the system running with it engine OBD2 diagnostic system hooked up to cycle the anti-lock brakes to bleed that pump system out.

1 people found this helpful.

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