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Old 05-28-2017, 01:20 AM
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Just replaced the brake booster and master cylinder..

And I've run into a problem. The pushrod that connects to the brake pedal is too short. Now the rod is keeping the pedal off of the brake switch and causing the brake lights to stay on. I am concerned I will have to remove everything again to adjust the rod as I'm sitting here with the old one in my lap trying to turn it and nothing is happening.. I really really dont want to take everything out again. I'm also concerned about the freeplay as there doesnt seem to be any and i dont want the brakes to lock up on me. I cjecmed the book and there isnt any mention of either of these things. Any suggestions?

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Old 05-28-2017, 06:49 AM
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This "sounds" like the brake pedal is not in the home position, all the way retracted.

Question the booster installed OEM or a good close match ?

Extending the length might solve the switch activation, however will not give you any more free play.. reading what I'm saying?

A picture of the old booster might give myself and others some helpful clues as to how to assist. The part information now installed, number & source, also will help .



Greg
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Old 05-28-2017, 08:13 AM
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Most booster pushrods have an adjustment capability. Also, every pedal-mounted brake light switch has an adjustment capability. Set the booster pushrod so the pedal is in the right place. Then adjust the switch. You did not tell us the make and model of vehicle or if it has stock pedals or not. I can only tell you that GM brake light switches are screwed into the clip that holds them, then pull the pedal upward and the switch will self-adjust to the correct place.
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Old 05-28-2017, 11:47 AM
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Its a 71 cadillac commercial chassis. Everything on it is stock. I got the new unit from rock auto and the brand is A-1 Cardone. The master and the booster came as one unit..

There was a spacer that was on the old power booster. I took it off and used it because it was longer on one side than the other and i assumed i needed it because the firewall was slanted. Maybe i dont need it? Regardless its looking like ill haveto take everything off again. I will try adjusting it by turning the rod firts of course. Of that doesnt work i will have to take it all off again and thats when i will take some pics
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Old 05-28-2017, 01:57 PM
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Ok upon inspection today ive learned 2 things: i fo need the spacer as the firewall is in fact at a slant. The rod is at a much shorter length and when i turn it it does nothing. Not sure what to do next.. I tried to upload a picture but i'mon my phone and its showing up as a broken link. Its about a half an inch or so from the brake switch. Also my landlord must have been loaded last night as there is plenty of free play in the pedal.
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Old 05-28-2017, 02:26 PM
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I have now taken it out. I can say it was a lot easier taking it out tje second time than ot was the first lol.. At first glance they look exactly the same rod length but opon measuring the first time the old one is 3 and 1/4 inches sticking out from the black tube and the new one is 3 and 1/8 inches. So we are only off 1/8th of an inch. I am turning the new one and it too is not moving back. I do not know what to do now. Is there a special tool to adjust these?
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Old 05-29-2017, 07:08 AM
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Quote:
Originally Posted by CadillacGirl_1966 View Post
I have now taken it out. I can say it was a lot easier taking it out tje second time than ot was the first lol.. At first glance they look exactly the same rod length but opon measuring the first time the old one is 3 and 1/4 inches sticking out from the black tube and the new one is 3 and 1/8 inches. So we are only off 1/8th of an inch. I am turning the new one and it too is not moving back. I do not know what to do now. Is there a special tool to adjust these?

LOL that's called experience

I'm glad to read you have the drive and ambition to solve problems. Keep up the good work

Greg
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