Shallow or Deep bore master cylinder?? - Chevy Nova Forum
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Old 20th-April-2017, 06:17 PM   #1
davenova327
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Shallow or Deep bore master cylinder??

I have 4 drums, a booster and a deep bore master. I also have spongy brakes when the car is running, firm when off. They've been bled and re-bled and there are no apparent leaks in the system. I'm reading several things that are making me think my issue is that I need a shallow master cylinder for my power setup?? Thoughts?????
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Old 20th-April-2017, 09:45 PM   #2
ART T
 
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You need a shallow. Some masters come with a spacer to put in the plunger.
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Old 20th-April-2017, 09:49 PM   #3
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Had the same problem,found out I had deep master and needed a shallow. So I went with double master cyl. with a 1 inch bore. At the same time decided to go with disc. on front and a porportional valve. Everything works great now. 65 chevyII Randy
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Old 20th-April-2017, 09:55 PM   #4
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Most aftermarket boosters come with two pushrods.one for shallow and one for deep. Also some masters come with a plug? to go in the deep well master to make it shallow. You will need to take it back apart and see what combination of parts you have to move forward in diagnosing the issue
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Old 21st-April-2017, 10:56 AM   #5
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Thanks all for the replies..its very appreciated! I do have it apart....I have a long pushrod and a deep master. So, I need the short pushrod with a shallow master? ....or the short pushrod and the spacer plug you guys mentioned?
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Old 21st-April-2017, 11:07 AM   #6
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If you have long push rod and deep bore master look elsewhere for your problem, should work fine that way
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Old 21st-April-2017, 12:20 PM   #7
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If you have long push rod and deep bore master look elsewhere for your problem, should work fine that way
D, oh! ...I thought i had an answer here.... back to the drawing board!

Just not sure where else to look. System has been bled. No leaks. Clevis rod adjusted to lower hole in brake pedal. 1/4" free play in pedal.

I have a distribution block under the master.... could it be something there? I've seen talk about needing a 10lb in-line valve to the rear..... others state that should be built into the master......
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Old 21st-April-2017, 12:46 PM   #8
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If they are spongy double check for no leaks anywhere in the fittings and bleed them more. If you want a tight higher pedal make sure you adjust all the brakes where they rub the drum pretty good. You might hear them rubbing, but maybe only on one side as the shoes can shift back and forth front to back a little. Don't be fooled by this when adjusting shoes. I like to have my tires on and jack them up going by feel and tighten them with a pretty good drag on them while spinning the drums(yeah it's harder on the rear with a posi, fronts are easy though). Won't take long for them to seat/settle in and you will get a good and full pedal.
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Old 21st-April-2017, 01:10 PM   #9
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If they are spongy double check for no leaks anywhere in the fittings and bleed them more. If you want a tight higher pedal make sure you adjust all the brakes where they rub the drum pretty good. You might hear them rubbing, but maybe only on one side as the shoes can shift back and forth front to back a little. Don't be fooled by this when adjusting shoes. I like to have my tires on and jack them up going by feel and tighten them with a pretty good drag on them while spinning the drums(yeah it's harder on the rear with a posi, fronts are easy though). Won't take long for them to seat/settle in and you will get a good and full pedal.
They've been bled pretty thoroughly....first by standing on the pedal...and then again using a vacuum bleeder. As far as the shoes...they were adjusted with the wheels off the ground as you say...and are out pretty far....i think maybe even a bit too far....but i have been trying to get the pedal up...... I'll double check the shoes though.....
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Old 21st-April-2017, 01:17 PM   #10
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If you have a power booster you need the shallow piston.
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Old 21st-April-2017, 01:23 PM   #11
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If you have a power booster you need the shallow piston.
I have come across this in several places....but I do wonder.... If I have a deep master with a long pushrod. A shallow master with a short pushrod doesn't work the same way? As long as there isn't too much distance between the rod and piston...it matters if that contact happens deeper inside the master or closer to the opening?
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Old 22nd-April-2017, 01:36 AM   #12
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Hope this helps. http://www.mpbrakes.com/techtalk/how...r-cylinder-gap

I want to say its the shoes that need adjusting or combinations of things.
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