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Username Post: Needing Booster Advice        (Topic#358852)
kajun 
"5th Year" Platinum Supporting Member
Posts: 44
kajun
Loc: Prairieville, Louisiana
Reg: 07-03-05
11-17-19 04:57 PM - Post#2780390    

My old 6 cylinder body car had no booster and a single master cylinder. That master cylinder was bolted up directly to the two of those six studs on the firewall. When I see pictures of original boosters, they also have studs. Studs to studs won't bolt up, at least not with out some other bracket. Did the cars that came with brake boosters have a different brake assembly than cars that came with no booster? Maybe non powered masters had brake pedal assemblies with studs and boostered masters had brake pedal assemblies without studs?

Eric



 


Oshawa65SS 
Contributor
Posts: 930

Age: 59
Loc: Burnaby BC Canada
Reg: 09-22-14
11-17-19 07:47 PM - Post#2780404    
    In response to kajun

Studs duplicated on the firewall because of the booster are to be knocked when converting to power brakes.
The 65 accessories installation manual has all the illustrations and instructions.
It's in pdf format in the reference material area or here on page 52:
https://toms427impala.info/CT/65AccessoryManual .pd...

Ryan

65 Impala SS convertible 283 2V with Powerglide and 10 bolt 3.08 open
Build date Dec. 21 '64 Oshawa


 
bigbowtielover 
Valued Contributor
Posts: 2564
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
11-17-19 08:01 PM - Post#2780406    
    In response to kajun

The bracket that the brake pedal swings from is different between power and manual brakes. Manual brake cars have 6 studs pressed in. Power brakes only has two studs pressed in (at the top). To add a booster you have to remove the 4 lower studs and drill out the serrations in the holes on the brace where they were pressed in. Drilling them out gives room to install booster without damaging booster stud threads.



 
chopr1 
Silver Supporting Member
Posts: 22
chopr1
Age: 72
Reg: 01-11-19
11-17-19 08:45 PM - Post#2780409    
    In response to Oshawa65SS

Ryan, thanks for posting the info. I'm in the same situation. Want to put PB booster on a 65 283. Your post answered a lot of my questions of what to expect when I do this. I need to get a manual all so!



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2228
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
11-18-19 07:52 AM - Post#2780429    
    In response to chopr1

The mounting studs on aftrmarket boosters are in a square pattern. On OEM boosters the two lower studs are 1/4" father apart. To mount the aftermarket booster you need to elongate each lower mounting hole inward 1/8". Seems someone used a step drill and just oversized the holes.




 
kajun 
"5th Year" Platinum Supporting Member
Posts: 44
kajun
Loc: Prairieville, Louisiana
Reg: 07-03-05
11-18-19 03:25 PM - Post#2780448    
    In response to aghaga

I like to think I'm pretty good at searching for things. I never looked in the 65 Accessory Installation Manual since I have a 66. And since my car was a 6 cylinder, 3 on the tree with absolutely zero options, nothing ever triggered me to look in the Accessory Manual. Hey that's my excuse and I'm sticking to it. Performance Online sent me the 11" booster by mistake. Their site says it hits the wiper motor on 66's, so that's going back. It seems the 11" booster is for 1967 (according to their site), 1967's must have a different wiper motor. Does this sound right?

As always, thanks for the help
Eric



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2228
aghaga
Age: 65
Loc: Altavista, Va.
Reg: 07-05-08
11-18-19 05:25 PM - Post#2780454    
    In response to kajun

9" booster is what came on 65&66




 
kajun 
"5th Year" Platinum Supporting Member
Posts: 44
kajun
Loc: Prairieville, Louisiana
Reg: 07-03-05
11-18-19 05:52 PM - Post#2780458    
    In response to aghaga

That's what I figured but since it's in my possession right now, I will just check it out to see what would prevent it from mounting up. Can't hurt.



 
bigbowtielover 
Valued Contributor
Posts: 2564
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
11-19-19 03:08 PM - Post#2780539    
    In response to kajun

One of my cars had a '67 booster on it. Lower bolt holes were hogged out to make it fit.



 
kajun 
"5th Year" Platinum Supporting Member
Posts: 44
kajun
Loc: Prairieville, Louisiana
Reg: 07-03-05
11-19-19 05:45 PM - Post#2780548    
    In response to bigbowtielover

This part of this project is a whole lot more fun than when I was scraping the crud off of the frame by hand.

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kajun 
"5th Year" Platinum Supporting Member
Posts: 44
kajun
Loc: Prairieville, Louisiana
Reg: 07-03-05
11-19-19 06:21 PM - Post#2780553    
    In response to kajun

I'm sure glad this part over. It was a great experience. Not exactly sure I want to do this again. I have a new respect for a person when they say "I" did the frame off restoration.

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