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Master Cylinder Convert to bigger master cylinder

#1 User is offline   e30 lexus v8 Icon

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Posted 02 June 2017 - 11:58 AM

Hi guys
I'm new to this forum
I have a e30 with a luxes v8 conversion.
Would like to change the master cylinder to a bigger cylinder and a smaller booster, is there other cars with a bigger cylinder.
The bmw is 22/19 with a 40mm stroke, would like to go 45/40 with a smaller booster?

Any suggestions
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#2 User is offline   Jeremy.D Icon

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Posted 02 June 2017 - 01:03 PM

View Poste30 lexus v8, on 02 June 2017 - 11:58 AM, said:

Hi guys
I'm new to this forum
I have a e30 with a luxes v8 conversion.
Would like to change the master cylinder to a bigger cylinder and a smaller booster, is there other cars with a bigger cylinder.
The bmw is 22/19 with a 40mm stroke, would like to go 45/40 with a smaller booster?

Any suggestions

Howzit bro. I know I'm not Admin (they'll ask you anyway) but please post an Intro in the right section then I'm sure everyone will be willing to help.
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#3 User is offline   MYBRIDH Icon

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Posted 02 June 2017 - 03:15 PM

As admin - Introduction please - ...so that I can ask you the question.

That is a massive size difference. Could you explain why the need. What other changes have been made to the brakes, other discs, larger multi piston calipers?

Info would help in case there is someone that could point you in the right direction.
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#4 User is offline   e30 lexus v8 Icon

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Posted 02 June 2017 - 03:54 PM

Its actually the booster that's not fitting, so i will need a smaller booster, probably a 7 inch instead of a 9/10 inch.
Would the smaller booster make a difference in the braking.
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#5 User is offline   zulu Icon

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Posted 02 June 2017 - 05:49 PM

As an alternative you could move the booster outwards towards the fender. It will entail a fair amount of stripping to gain access to the firewall but may solve your problem ...particularly if the present combo meets your needs.
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#6 User is offline   MYBRIDH Icon

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Posted 02 June 2017 - 10:06 PM

View Poste30 lexus v8, on 02 June 2017 - 03:54 PM, said:

Its actually the booster that's not fitting, so i will need a smaller booster, probably a 7 inch instead of a 9/10 inch.
Would the smaller booster make a difference in the braking.


I am no brake booster expert so cant comment on that too much. There are guys on the forum who have successfully (it would appear) converted to different booster and master cylinder setups, and I hope they chime in with suggestions.

What I will tell you with fair certainty is that if you make as big a change in master cylinder size as you had indicated you wont get your car stopped.
Larger master cylinder piston sizes (with stock calipers) would result in you having to apply a lot more pedal pressure. Per the sizes you mentioned around 4 times the pedal pressure.
If you are going to change to another master cylinder and booster setup my suggestion would be to stay as near stock as you can with regards to master cylinder size combined with a smaller booster that fits into the space you have.

Later
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#7 User is offline   Sp33dy Icon

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Posted 05 June 2017 - 07:23 AM

Try a booster from a Datsun 1400 bakkie. It's a direct bolt-on and it's really small, but also manages to boost the brake effort properly. When I did the throttle conversion on my car it was the best solution I could find for booster space issues.
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