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1990 Chevy Brake Problem / Question

Discussion in 'Chevy Trucks' started by wsmm, Jul 28, 2011.

  1. wsmm

    wsmm Member
    Messages: 80

    I have a 1990 Chevy 1/2 ton pickup with the RWABS only system. Had to replace my rear brake line last year, rusted through. Put on new brake lines and bled brakes. Now if I tend to put the brakes on hard, and sometimes when I just do it easy the brake warning light in the instrument cluster comes on. If I tap the brake peddle once or twice the light goes back out. I have not been able to figure out what is causing it, also my brake pedal seems to go a little low. Any suggestions would be greatly appreciated.

  2. maverjohn

    maverjohn Senior Member
    Messages: 902

    Try bleeding the hole system, front and back.
  3. South Seneca

    South Seneca Senior Member
    Messages: 474

    I had to replace a valve in my 93 brake system, to solve that problem. I think it was called a portioning valve.
  4. BlizzardBeater

    BlizzardBeater Senior Member
    from Maine
    Messages: 420

    Start simple. Check to see if the master is a little low on fluid, then re-bleed the system, then pull the drums off the rear to make sure everything is dry and functioning.
  5. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    The sensor wires could have a problem. The sensor itself could be going. Some systems you need to bleed the ABS controller too. Look and see if it has bleeders on it. Some need a scan tool to activate the system to bleed it. Look at the level in the master cylinder reservoir. Some have a brake warning light when the level gets low. That sensor may be bad or sticking.