master cylinder - Chevelle Tech
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post #1 of 25 (permalink) Old Oct 4th, 19, 8:20 PM Thread Starter
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master cylinder

hello all i have a 1970 chevelle SS trying to get the correct master cylinder for it, any ideas and where can i get one searched EBAY nothing, there is a aftermarket master in there now. had put a correct 11 inch booster in with delco moraine tag on side, pedal seemed low any ideas on pedal height when applied any help is good Ty

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post #2 of 25 (permalink) Old Oct 4th, 19, 9:06 PM Thread Starter
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Re: master cylinder

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Originally Posted by roadster601 View Post
hello all i have a 1970 chevelle ss trying to get the correct master cylinder for it, any ideas and where can i get one searched ebay nothing, there is a aftermarket master in there now. Had put a correct 11 inch booster in with delco moraine tag on side, pedal seemed low any ideas on pedal height when applied any help is good ty
is there a part # for the master ty

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post #3 of 25 (permalink) Old Oct 4th, 19, 9:07 PM
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Quote:
Originally Posted by roadster601 View Post
hello all i have a 1970 chevelle SS trying to get the correct master cylinder for it, any ideas and where can i get one searched EBAY nothing, there is a aftermarket master in there now. had put a correct 11 inch booster in with delco moraine tag on side, pedal seemed low any ideas on pedal height when applied any help is good Ty
The 70 big block master cylinder is a one year only item. They are very rare and hard to find. Should you find one - there is a small machined area at the front on the MC. On this pad will be two BB in capital letters.
Should you find one - they are easily rebuilt
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1970 Astro Blue SS396 L34
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post #4 of 25 (permalink) Old Oct 4th, 19, 9:18 PM
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Re: master cylinder

The depth of the hole in the rear of the cylinder needs the correct length plunger. This can be different from year to year.
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post #5 of 25 (permalink) Old Oct 5th, 19, 9:06 AM
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Re: master cylinder

Part number 5470409 is cast into the bottom of the MC.
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1970 Astro Blue SS396 L34
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post #6 of 25 (permalink) Old Oct 7th, 19, 10:24 AM Thread Starter
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Re: master cylinder

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Originally Posted by George Halpin View Post
Part number 5470409 is cast into the bottom of the MC.
hello i been reading the early chevelles my car Feb used round master with bleeders,later chevelles used the 409 which is rectangle what do i do, Ty again

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post #7 of 25 (permalink) Old Oct 7th, 19, 1:08 PM
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Re: master cylinder

I would put back whatever MC is on there right now.BTW, what MC is on there right now ?
One other thing,are you sure you need a new MC ? If "pedal height" is your only concern with no leakage from the MC and pedal does not drop completely to the floor then maybe your problem is something else ?
Brake pedal height with a disc/drum system is largely dependent on the rear brakes being adjusted correctly.That includes the brake shoes and the parking brake cable adjustment.When was the last time you checked the rear brakes ?
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post #8 of 25 (permalink) Old Oct 7th, 19, 1:33 PM Thread Starter
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Re: master cylinder

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Originally Posted by 71350SS View Post
I would put back whatever MC is on there right now.BTW, what MC is on there right now ?
One other thing,are you sure you need a new MC ? If "pedal height" is your only concern with no leakage from the MC and pedal does not drop completely to the floor then maybe your problem is something else ?
Brake pedal height with a disc/drum system is largely dependent on the rear brakes being adjusted correctly.That includes the brake shoes and the parking brake cable adjustment.When was the last time you checked the rear brakes ?
i know

lou
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post #9 of 25 (permalink) Old Oct 8th, 19, 7:58 PM Thread Starter
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Re: master cylinder

Quote:
Originally Posted by 71350SS View Post
I would put back whatever MC is on there right now.BTW, what MC is on there right now ?
One other thing,are you sure you need a new MC ? If "pedal height" is your only concern with no leakage from the MC and pedal does not drop completely to the floor then maybe your problem is something else ?
Brake pedal height with a disc/drum system is largely dependent on the rear brakes being adjusted correctly.That includes the brake shoes and the parking brake cable adjustment.When was the last time you checked the rear brakes ?
last week i checked rears all good fronts good as i asked i have read early 70 chevelles used a round master cylinder with bleeders am i correct, my car is a Feb car.pedal height is about 2 inches off the floor pedal depressed
the master that was on there was leaking by plunger, so the 409 master is a later master rectangular unit.

lou
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post #10 of 25 (permalink) Old Oct 9th, 19, 1:20 PM Thread Starter
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Re: master cylinder

Quote:
Originally Posted by 25C 70 View Post
The depth of the hole in the rear of the cylinder needs the correct length plunger. This can be different from year to year.
so for my 70 chevelle would you have the answer

lou
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post #11 of 25 (permalink) Old Oct 9th, 19, 1:50 PM Thread Starter
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Re: master cylinder

Quote:
Originally Posted by roadster601 View Post
hello all i have a 1970 chevelle SS trying to get the correct master cylinder for it, any ideas and where can i get one searched EBAY nothing, there is a aftermarket master in there now. had put a correct 11 inch booster in with delco moraine tag on side, pedal seemed low any ideas on pedal height when applied any help is good Ty
hello again does anyone know whats correct for my 1970 SS Feb car round or rectangular master cylinder

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post #12 of 25 (permalink) Old Oct 9th, 19, 2:14 PM
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Re: master cylinder

This looks correct. The price is reasonable.
https://www.camarocentral.com/1970_1...p/brc-432b.htm

70 LS5 convertible
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post #13 of 25 (permalink) Old Oct 9th, 19, 2:22 PM Thread Starter
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Re: master cylinder

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Originally Posted by 12stones View Post
This looks correct. The price is reasonable.
https://www.camarocentral.com/1970_1...p/brc-432b.htm
my question is being a early chevelle would it use a round master

lou
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post #14 of 25 (permalink) Old Oct 9th, 19, 2:27 PM
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Re: master cylinder

https://www.chevelles.com/forums/35-...er-1970-a.html

https://www.google.com/search?q=corr...iw=864&bih=405

February car built in what plant?
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Last edited by davewho1; Oct 9th, 19 at 2:33 PM. Reason: added info
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post #15 of 25 (permalink) Old Oct 9th, 19, 3:02 PM Thread Starter
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Re: master cylinder

Baltimore thanks dave
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