64-5 PB support bracket different than MB, Why? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 14 (permalink) Old Aug 30th, 17, 2:09 PM Thread Starter
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64-5 PB support bracket different than MB, Why?

A friend wants to convert his MB to PB on his 64 Chevelle. It looks like the 64-5 Support Bracket is different for manual brakes (3858377)as opposed to power brakes (3841801).

Why would this be? Has it something to do with the angle the MC sits relative to horizontal?

Looks like in 66 and 67 the support brackets for MB and PB were the same and different from 64-65.


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post #2 of 14 (permalink) Old Aug 30th, 17, 4:16 PM
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Re: 64-5 PB support bracket different than MB, Why?

Those part numbers must be unique to 64, 65 uses a completely different part number.

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post #3 of 14 (permalink) Old Aug 30th, 17, 4:34 PM
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Re: 64-5 PB support bracket different than MB, Why?

As far as I know power breaks were never an option on 64-65 so why would there be a different bracket number. I can tell you this I've converted 4 malibu's and elcaminos and all I did was bolt the booster up.

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post #4 of 14 (permalink) Old Aug 30th, 17, 4:49 PM
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Re: 64-5 PB support bracket different than MB, Why?

Quote:
Originally Posted by zombie1969 View Post
As far as I know power breaks were never an option on 64-65 so why would there be a different bracket number. I can tell you this I've converted 4 malibu's and elcaminos and all I did was bolt the booster up.
Power brakes were available in 64 and 65. RPO J50. Pretty common actually.
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post #5 of 14 (permalink) Old Aug 30th, 17, 5:20 PM Thread Starter
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Re: 64-5 PB support bracket different than MB, Why?

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Originally Posted by Rich-L79 View Post
Those part numbers must be unique to 64, 65 uses a completely different part number.
Could be,as I have 386683 for 65 with manual brakes, couldn't find a number for 65 with PB. Also numbers from parts books are sometimes different then assembly manual , then there are those mid year and 1st & 2nd design things.


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post #6 of 14 (permalink) Old Aug 30th, 17, 6:59 PM
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Re: 64-5 PB support bracket different than MB, Why?

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Originally Posted by Rich-L79 View Post
Power brakes were available in 64 and 65. RPO J50. Pretty common actually.
I didn't know there was an option I've never owned one with anything more than a single res. Never seen one in the salvage yards with power either when you could still find these cars. Not sure a agree it's a common option from my experience but I don't hunt for optioned cars only look for something I can build that isn't beyond repair not a numbers guy.

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post #7 of 14 (permalink) Old Aug 30th, 17, 7:04 PM
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Re: 64-5 PB support bracket different than MB, Why?

The actual pedal arm inside has 2 holes to alternately use for manual or power brakes. The upper hole is used for manual and the upper for power brakes setup. The lower hole dictates the angled M/C setup so the push rod is in a direct line to the M/C. FWIW

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post #8 of 14 (permalink) Old Aug 30th, 17, 7:37 PM Thread Starter
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Re: 64-5 PB support bracket different than MB, Why?

Looks like in 65 the support bracket was 3866853 for manual brakes.


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post #9 of 14 (permalink) Old Aug 30th, 17, 7:45 PM Thread Starter
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Re: 64-5 PB support bracket different than MB, Why?

Quote:
Originally Posted by OLDED View Post
The actual pedal arm inside has 2 holes to alternately use for manual or power brakes. The upper hole is used for manual and the upper for power brakes setup. The lower hole dictates the angled M/C setup so the push rod is in a direct line to the M/C. FWIW
I see the pedal is the same for both manual and power brakes and according to the photo I am looking at it has two (2) different holes.

In 66 same support 3876555 for both manual and power. And a change to 3895199 in 67 for both manual and power.

There must have been something different in 64-5; but who knows what?


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post #10 of 14 (permalink) Old Aug 30th, 17, 7:49 PM
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Re: 64-5 PB support bracket different than MB, Why?

Quote:
Originally Posted by james a larson View Post
Could be,as I have 386683 for 65 with manual brakes, couldn't find a number for 65 with PB. Also numbers from parts books are sometimes different then assembly manual , then there are those mid year and 1st & 2nd design things.
You couldn't find a PB part number because there wasn't one. Just one version was used in 65.

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post #11 of 14 (permalink) Old Aug 31st, 17, 10:56 AM
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Re: 64-5 PB support bracket different than MB, Why?

Quote:
Originally Posted by Rich-L79 View Post
Power brakes were available in 64 and 65. RPO J50. Pretty common actually.
Quote:
Originally Posted by zombie1969 View Post
I didn't know there was an option I've never owned one with anything more than a single res. Never seen one in the salvage yards with power either when you could still find these cars. Not sure a agree it's a common option from my experience but I don't hunt for optioned cars only look for something I can build that isn't beyond repair not a numbers guy.
From 1964 Chevelle Options and 1965 Chevelle Options:

Quote:
Year---RPO-------Description-------Quantity
1964---J50---Vacuum Power Brakes----37,739
1965---J50---Vacuum power brakes----29,236
From 1964 Chevelle Production Numbers by Series/Model and 1965 Chevelle Production Numbers by Series/Model:

Quote:
-------------------------1964------1965
Total Production--- 353,225---370,139
Export-----------------17,608------8,479
Total------------------370,834---378,618
I let anyone judge by themselves if it should be considered pretty common or not. I'm not getting in the middle of that fight.


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post #12 of 14 (permalink) Old Aug 31st, 17, 12:42 PM Thread Starter
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Re: 64-5 PB support bracket different than MB, Why?

1964-66 Chevelle Pedal Assembly

If these are correct, it looks as if the different part numbers may have been due to differences in how they mount to the different dashs. Maybe in 64 PB vs MB had a different supports bracket. In 65 maybe they used the same bracket as well as in 66.


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post #13 of 14 (permalink) Old Sep 1st, 17, 8:35 PM
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Re: 64-5 PB support bracket different than MB, Why?

That guy at 4 speed conversions looks like he his stuff nailed up pretty tight. Is he known here?

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post #14 of 14 (permalink) Old Sep 5th, 17, 12:04 PM
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Re: 64-5 PB support bracket different than MB, Why?

Speaking for 1965.

There is one support bracket for manual and power brakes and for automatic and manual shift.
The brake and clutch pedals are the same for manual and power brakes.

The brake pedals is different for automatic and manual shift.

I suspect but am not sure that 64 and 65 brackets and pedals are the same as 65. Can someone confirm one way or the other.

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