Brake booster install pics
I converted the 69 to power brakes today, still drum drum. Used a 1/2 ton booster I bought off the parts board.
Parts list: booster & bracket+pushrod, new pushrod boot, vacuum T fitting, 2 ft vacuum hose, booster vacuum check valve if needed. As it was http://67-72chevytrucks.com/gallery/...3/DSC02694.jpg The old vacuum connection for the trans, need to install T fitting to hook booster to. http://67-72chevytrucks.com/gallery/...3/DSC02695.jpg New fitting installed http://67-72chevytrucks.com/gallery/...3/DSC02696.jpg Have to disconnect push rod under dash for m/c http://67-72chevytrucks.com/gallery/...3/DSC02697.jpg I removed the pedal stop plate under the dash for working room. The bolt will hit the column, remove the master cyl nuts first so you can push the pedal way down for clearance. http://67-72chevytrucks.com/gallery/...3/DSC02698.jpg Master cylinder unbolted and moved out of way http://67-72chevytrucks.com/gallery/...3/DSC02699.jpg Booster bolted to firewall with master cyl, don't forget to get a pushrod boot for power brakes, it's different. Hook the pedal up first, before bolting the unit in, so you can have the pedal down to put the pivot bolt in. http://67-72chevytrucks.com/gallery/...3/DSC02700.jpg Together inside with new pedal pad http://67-72chevytrucks.com/gallery/...3/DSC02701.jpg Hooked up outside with vacuum line to new fitting. http://67-72chevytrucks.com/gallery/...3/DSC02702.jpg Oh yeah, don't forget to adjust the brakelight switch because th e pedal will be slightly lower. |
Re: Brake booster install pics
Hopefully I'll be doing just this soon. Did you need to lengthen any brake lines or was their enough slack to just slip the booster in behind the master? Did you need to re-bleed the brakes afterwards?
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Re: Brake booster install pics
Lippyp- the lines were long enough, just had to carefully bend and reposition them forward, and since I didn't disconnect them from the master cyl, no bleeding involved!
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Re: Brake booster install pics
can you show a pic of the pushrod boot? I am a noob and don't know where that is so i don't know what to look for when i'm picking up parts for this. Thanks!
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Re: Brake booster install pics
Boot pops into hole in the firewall where the pushrod comes through to the pedal, pic #6
Picture of boot i bought: http://www.gmcpauls.com/pictures/47-...tpowerbstr.jpg |
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Did you use the same hole in the brake pedal?I heard you need to use a different hole in the lever for power brakes.
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Same hole,, tread lightly on the pedal till ya get used to it.......
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Re: Brake booster install pics
Have you experienced any vacuum issues?? I only ask because I've had a few mechanic buddies of mine tell me the brake booster needs it's own dedicated vacuum source. On my stock power brake trucks, the brake booster vacuum is tapped into the backside of the carb. My edelbrock has a port, but it's not the same size as the stock line/tube I pulled from the donor truck.
Just curious. Oh, and I sure wish I would've read your last tech tip before I thought I had finished. had to drop the column and the rod after I was "done" to adjust the switch. I do that kinda stuff alot. |
Re: Brake booster install pics
No vac problems as of yet, my carb didn't have the port iirc, the fitting I used was from a manifold in the shed and looked right.
Only problem I've heard was Longhorn Man lost the booster diaphragm and the vacuum leak fried the piston on the cylinder under the fitting (see pic 2&3) because the fitting is on the intake runner leading to that cylinder. Connected to the carb would distribute a vacuum leak across all cylinders. |
Re: Brake booster install pics
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I've got a 67 im gonna be swapping to pb's using the booster and such off my 68. But gonna use a 80's master since Im swapping to those discs in the front. Im gonna try and compare the brake pedals and see if they're actually any different. Good to hear the swap is pretty straight forward. |
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If you were working on a Chevelle, you would drill a new rod mount hole in the pedal to change the leverage. |
Re: Brake booster install pics
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My personal experience was great - it was a piece of cake - I spent a week cleaning my stuff up and then a week contemplating doing it... hemming and hawing... it took all of about 45 mintues I think to do it and that was because I looked it over 3 times afterwards to see if I missed anything.
Watch your first trip on the road - I about put myself and the steering wheel through the windshield - to me, it makes a WORLD of difference. As for a leaking diaphram buring up a valve, would that be why the check valve is in place where the hose meets up with the booster? Or as later models have one inline before the booster? |
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Re: Brake booster install pics
The truck brake linkage has only one mounting hole on the pedal arm. It is best to look at another truck to get the linkage geometry correct.
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Re: Brake booster install pics
LUV, the check valve holds vacuum in the booster, if the engine stops, you still have booster power for one stop....the hydroboost has an accumulator for that same reason, it's that gold colored 4" long can that sticks out of the h/b unit.
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