Question about 1994 Chevrolet C1500

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Pedal goes to floor almost. new master cylinber & bled all brakes & master cylinder whuch didnt solve problem. possibly electrical or stuff under master cylinder?

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  • silver top May 11, 2010

    if pedal goes down on first press ? can you pump pedal a couple of times and pedal then holds at top as if ok ?

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  • Master
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The "pedal goes to floor" is a mechanical problem and it more than likely that there is still air in the system and that the bleeding is not complete. Find level ground and start at the back of the truck with the hand brake off, chock the wheels if needed. Fill the brake fluid reservoir. Loosen the bleed screw on the back brake assembly and have a colleague depress the brake. Tighten and release the brake, NEVER allow the brake pedal to rise when the bleed screw is loose as this will **** air back into the system. Undo the bleed screw about half a turn and again depress the brake, tighten off at bottom of stroke and again release the pedal. Every couple of times top up the brake fluid reservoir. Keep pushing fluid through until about half a pint has been expelled from the bleed screw assembly. Tighten off the bleed screw for good. Go the other rear wheel and repeat the process making sure that the reservoir never runs out of fluid. . Now go to the front and repeat with both wheels. There should come a time that your colleague can report that there is increasing resistance when standing on the brake pedal. If after all this the pedal continues to sink to the floor it sounds like the seal on the master cylinder piston is defective or there is a leak in the brake line.

Posted on Apr 24, 2010

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  • Chevrolet Master
  • 2,100 Answers

How many times did you go around with the bleeder? It might take about 4 times around to get it right. Start with the right rear, the farthest from the master, and work you way around to the front left. Then do it again. Untill you get a pedal. That should do it, I don't think it has anything to do with the ABS or the distribution box. One thing to check is the vacuum line on the power break booster. Hope this helps.

Posted on Apr 24, 2010

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