Asked by May 17, 2011 at 12:50 AM about the 1978 Chevrolet Suburban

Question type: Maintenance & Repair

Hi all. I've got a 1978 Chevrolet Suburban. I have always had brake troubles with it. It has a nearly new Proportioning valve on it. However, my brake light always stays lit and it feels as though I hardly ever have the appropriate pressure. I have replaced master cylinders countless times. Any suggestions as to what my problem is? Thanks Chris.

4 Answers

Similar problem, pedal goes to floor at low speeds and idle fine once pressure is built up or high speeds did you ever get it figured out?


there is a electric switch under hood on right side about 6 inch back from radiator my be bad brake pressure brakes need bleed or adjusted will fix problem will have to do about 2 times a year

1 out of 1 people think this is helpful.

Nope I still haven't gotten it figured out. However, yes at slow speeds it wants to go to the floor. The shop that put the valve on it couldn't figure it out. I heard of a trick of tying the calipers to the A-arms to help get air out of the system. I'm not sure if that will work. Thanks for your responses. Much appreciated! Forgot I posted this.


If they are old the rubber hoses near the rear brakes could actually be stretching causing the system to loose preasure.

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