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Mod | | | Forums66 Topics128,081 Posts1,056,077 Members48,434 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | I have a 49 GMC 1/2 ton. I changed to rack and pinion front axle with power disc brakes, When I hook up the vacuum the power assist works fine, but the pedal does not return to the full up position and the brake lights stay on. I can pull the pedal up with my foot and it will stay up until the next time I use them but then does not return up the next time with out foot assist. If I disconnect the vacuum the pedal returns to the up position and the brake lights turn off everytime they are used. I have the original brake light switch in and as far as I can tell there is no adjustment on that. It doesn't bother me that the pedal stays an inch or two down as long as the brake lights go out.
So my question is how do I get the pedal to return to the up position or is there an adjustable switch available or a modification to the existing switch or etc. etc.
Any suggestions would be appreciated. | | | | | Joined: Feb 2016 Posts: 1,989 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,989 | I would figure out a way to add a return spring to the brake peddle.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | What kind of power assist are you running? What type of master cylinder are you using and where is it mounted? | | | | | Joined: Oct 2019 Posts: 341 'Bolter | | 'Bolter Joined: Oct 2019 Posts: 341 | Is there an adjustment for the length of the brake rod? Lengthen it to eliminate the excessive pedal play. | | |
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