Master cylinder with Disc/Disc brakes

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On 2006-06-25 20:32, Farlainer wrote:
Verify this before you try it by asking someone who knows mastercylinders. Some guys discourage this so they can sell you a new more expensive one. </BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>
Um hum....[img]/forums/images/smiles/icon_lame.gif[/img] I'm a cheap irish bandage and even I would hack up the extra $1 for a Versailles or SVO MC. Discs require more fluid than drums and the MCs are designed accordingly. Not to mention that the residual valves are a PITA to get out of an MC and most people screw up the MC in the process. Is your life worth $1?
[addsig]

I'm sorry not everyone is such a know it all like "retroo", the world needs big "I ams" to tell you you're doing something wrong. I mentioned something that worked, not whether it was right or wrong. Plus, it was done at a time when there weren't many affordable aftermarket choices available. You have to read the statement completely, process the information in your brain and then engage your mouth and opinions, otherwise you may look like a donkey blowing your horn. I would not modify a mastercylinder today with the available choices. But like I said, I was given good instructions, I follwed them precisely and like in true hot rod fasion, it worked and worked well. Certain procedures may require a technique not everyone posesses. And it is an advantage if there are step by step instructions to follow, hopefully written by a competent person who has done the task. This is not for everyone.
When you know the amounts of how much fluid is displaced by a calipers' piston area due to its displacement and the distance it travels in its bore multiplied by the number of pistons in that caliper vs the volume of the wheel cylinders' opposing pistons and their distance of travel pushing out brake shoes, professor, let me know I can learn more from you.

<font size=-1>[ This Message was edited by: Farlainer on 6/29/06 12:35am ]</font>

A wise man once said "I dont know what you dont know" and most people I've heard suggest what you suggested dont have a clue...obviously I was wrong in assuming that, sorry!

How is that aftermarket or expensive? I agree that that was probably a
good option back then, given not too many people knew about all the interchangabilty, but this is 2006 and I'd rather make use of what's available now.

Give me a dial micrometer (or a half decent set of precsion tools) and I'd measure and compare the volumes. I know that the Mk7 rear disc piston is around 60mm, and the stock small drum wheel cyl is smaller, both are single piston.

[addsig]

The wisest man said, " Never argue with an idiot because bystanders will get confused on who the idiot is".

I use a 68 vette M/C for manual 4 wheel disc. 1" bore. its big!

You will have to elongate the mounting holes about 1/32"
[addsig]

I'm almost starting to feel inadequate using a stock 1 inch bore drum only master cylinder with my 4 wheel disk setup. I mean it only cost $24. I could have spent a lot more on an aftermarket 1 inch bore master cylinder and felt better about myself and the brake experts would have been satisfied with my intelligence. No adjustable proporting valve either although I had one and had to take it out to get enough fluid to the rear .
[addsig]

You should.


[img]/forums/images/smiles/icon_wink.gif[/img]

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On 2006-06-28 09:15, mikeandnatasha wrote:
I'm almost starting to feel inadequate using a stock 1 inch bore drum only master cylinder with my 4 wheel disk setup. I mean it only cost $24. I could have spent a lot more on an aftermarket 1 inch bore master cylinder and felt better about myself and the brake experts would have been satisfied with my intelligence. No adjustable proporting valve either although I had one and had to take it out to get enough fluid to the rear .

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I think you just answered yourself. most drum brake MC's have stepped pistons. Not enough fluid to the rear would be a problem in my book.
[addsig]

No stepped cylinder here. Stock 67 mustang type mater. Had it apart when i powder coated it and it was 1 inch bore straight through. Had a 1 1/8" bore corvette unit on the before and it didnt work worth a flip. Lots of pedal and not much braking. The $24 mustang drum/drum unit works just the same as a expensive aftermarket unit. I did use 2 lb wildwood check valves in line to the front and back with no combination valve.


The not having enough fluid to the rear part was because of the slow pressure rise with the adjustable proportioning valve. I'm running 13 inch wide drag radials and the rear brakes locking up is the last of my concerns. Theres enough rubber on the road to grip way past what the brakes will hold. The adjustable prop valve was only making my braking worse...not better. I'm using stock cougar disks in front with GM metric calipers in back that are stock to a late model camaro front application with T Bird rear disks all wrapped up on the ends of a Dana 60. No parking brake. Stops on a dime.
[addsig]

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On 2006-06-28 21:21, mikeandnatasha wrote:
I did use 2 lb wildwood check valves in line to the front and back with no combination valve.

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Hey, you can't argue with success. But I'm curious, why the check valves? Normally we use these when the MC is mounted lower than the wheel cylinders (like in a street rod) to maintain pressure in the line and to keep the fluid from coming back to the MC and overflowing it.



_________________
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<font size=-1>[ This Message was edited by: bytemydust on 6/29/06 11:36pm ]</font>