Any adjustment in booster pin? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 23 (permalink) Old Apr 14th, 08, 8:13 AM Thread Starter
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Mike
 
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Any adjustment in booster pin?

I think I read 200 posts this weekend on brake master/ booster pins and pedal linkages. It helped diagnose my bleeding problem. I found that I couldn't bleed the brakes until I backed off on the MC mounting bolts. Too long of a booster pin I assume. I know I can adjust the pedal side linkage - but do stock booster pins have any adjustability? Luckily mine needs to be shorter - so I know how to make that permanent change!


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post #2 of 23 (permalink) Old Apr 14th, 08, 9:09 AM
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Re: Any adjustment in booster pin?

when I installed a 78 master cylinder in my 66, I had to cut and grind my booster pin. To finish up the pin I placed it in a drill and used emery paper to smooth out the grinding. Hind sight tells me that I could have used the drill at the same time I was grinding and would have had a better radius from the get go.

Don Pizzi
66 el camino LT1
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post #3 of 23 (permalink) Old Apr 14th, 08, 10:16 PM Thread Starter
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Mike
 
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Re: Any adjustment in booster pin?

I pulled the pin tonight and it measures just over 4" end to end. I've read that the there are 2.6" pins and 6" pins - I'm guessing that 4" is no good - can any one confirm the size for a 67 PDB?


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post #4 of 23 (permalink) Old Mar 2nd, 11, 12:36 AM
Troy
 
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Re: Any adjustment in booster pin?

The 67 uses the 4" Pin. The 66 uses the 2 3/8" Pin
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post #5 of 23 (permalink) Old Mar 4th, 11, 8:09 PM
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Randy
 
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Re: Any adjustment in booster pin?

When I bought the MC/Booster combo from Ground Up, it came with the long one installed. I bought the shorter one, installed it and never looked back.

Hope I helped.
Randy

69 SS 396 Auto, Lemans Blue, Parchment.
69 SS 396 El Camino Custom, Cortez Silver, Warranty cars: 2008 Avalanche 4WD Black,
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post #6 of 23 (permalink) Old Mar 4th, 11, 9:09 PM
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Denny
 
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Re: Any adjustment in booster pin?

There are basically 4 types of booster pushrod:
  • manual brake threaded pushrod
  • power brake shallow recess «Delco-Moraine» pushrod
  • power brake deep recess «Delco-Moraine» pushrod
  • power Brake deep recess «Bendix» pushrod (adjustable)

Read this post for more info.

manual brake threaded pushrod:



power brake shallow recess «Delco-Moraine» pushrod:



power brake deep recess «Delco-Moraine» pushrod:



power Brake deep recess «Bendix» pushrod (adjustable):



Here's the difference between a «deep recess» m/c and a «shallow recess» m/c:



Some m/c manufacturers have a removable insert in their m/c to accommodate both designs (check if this is not your case):





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post #7 of 23 (permalink) Old Mar 4th, 11, 9:33 PM
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Re: Any adjustment in booster pin?

I think we now know who the resident brake booster and master cylinder guru is. That was some pretty good info. Thank you.
My suggestion would be to make some shims to put between the cylinder and the booster. That way you have a reversible modification. Yes, I know that if things are going well, there should be no need for any modification. But, sometimes you got to take the path of least resistance if it gives the proper result.
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post #8 of 23 (permalink) Old Mar 30th, 12, 2:25 PM
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Jerry
 
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Re: Any adjustment in booster pin?

I had the adjustable Bendix type rod for the power booster that came with my project. I had to buy a new M/C for the front disc/rear drum I had on the car. I found that the adjustable pin was too long, so I removed the adjustable nut portion, cut the rod, and drilled and tapped it to accept the nut again. Then, I had a shorter, but still adjustable, rod.

Jerry
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post #9 of 23 (permalink) Old Mar 30th, 12, 6:18 PM
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Gary
 
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Re: Any adjustment in booster pin?



Ran into this issue before getting rebuilt master cylinders. Now I always take the core with me and check the depth with a pencil in front of the parts guy in case it's wrong. One time the place had 3 on the shelf. All had the same part number. Two were wrong, one was correct for my application.
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post #10 of 23 (permalink) Old May 17th, 12, 11:24 PM
Tim
 
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Re: Any adjustment in booster pin?

Quote:
Originally Posted by 67_MALIBU_454 View Post
The 67 uses the 4" Pin. The 66 uses the 2 3/8" Pin
Any idea where I can buy or pick up the 1966 pin that is 2 3/8" ?
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post #11 of 23 (permalink) Old May 19th, 12, 1:31 PM
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Denny
 
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Re: Any adjustment in booster pin?

Quote:
Originally Posted by trailboss05 View Post
Any idea where I can buy or pick up the 1966 pin that is 2 3/8" ?
CPP has one:

POWER BRAKE BOOSTER BOOT, CLEVIS & PIN KIT
6474SRBSP 2-3/8” booster pin, each $2.00


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post #12 of 23 (permalink) Old Jul 10th, 12, 11:48 PM
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Dave
 
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Re: Any adjustment in booster pin?

I had a whole pile of MCs and Boosters in the shop when I was putting my brakes together and none fit with each other or if they did didn't seal. I'm running drums, and figured out that for disc and drum, power and manual, all are different and don't interchange. got new mc and booster for about $200
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post #13 of 23 (permalink) Old Aug 22nd, 12, 3:51 PM
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Denny
 
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Re: Any adjustment in booster pin?

This is a re-post of post #6 as one picture wasn't available anymore:

Quote:
Originally Posted by Jack Action View Post
There are basically 4 types of booster pushrod:
  • manual brake threaded pushrod
  • power brake shallow recess «Delco-Moraine» pushrod
  • power brake deep recess «Delco-Moraine» pushrod
  • power Brake deep recess «Bendix» pushrod (adjustable)

Read this post for more info.

manual brake threaded pushrod:



power brake shallow recess «Delco-Moraine» pushrod:



power brake deep recess «Delco-Moraine» pushrod:



power Brake deep recess «Bendix» pushrod (adjustable):



Here's the difference between a «deep recess» m/c and a «shallow recess» m/c:



Some m/c manufacturers have a removable insert in their m/c to accommodate both designs (check if this is not your case):





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post #14 of 23 (permalink) Old Feb 9th, 14, 11:57 PM
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Frank Riley
 
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Re: Any adjustment in booster pin?

Most Brake Boosters come with both length Master Cylinder Actuator Rods...

70-454 LS5

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post #15 of 23 (permalink) Old Jan 20th, 15, 6:14 PM
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James
 
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Re: Any adjustment in booster pin?

The master cylinder should fit flush against the booster and still have 1/8" gap, right?

I am going from manual drum brakes to front power discs using The Right Stuff conversion kit. When I go to install the master onto the booster, there is about 1/8" interference (and no play). It happens with both the short rod (in the booster)/adapter pin (in the MC) or long rod/no adapter. This makes it not fit flush unless I bolt it together, which basically makes the brakes fully engaged (i think?).

Do I shim it or do I turn down the booster pin? ...or am I doing something wrong?

Thanks!
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