razzle308
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Getting rid of booster
Hi.
Has anyone done a "reasonably" simple mod to make the booster obsolete on a MK2.
Despite all the work i have done - it's something i am not very familliar with.
Are there any oversized master cylinders that witll fit?
Thanks.
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Noono
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RE: Getting rid of booster
2011/02/03 21:57:28
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I think you'd want a smaller m/c
Force produced by pedal on smaller m/c area = greater fluid pressure = more force applied by caliper pistons
I've yet to do it, but apparently a datsun 120y m/c (no. JB1196) works well. Its 11/16" dia.
An adaptor has to be made up to fit at firewall because mount holes are at 90 deg. to original
Cheers, Gregg
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razzle308
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RE: Getting rid of booster
2011/03/03 01:39:46
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Awesome, thank you. i'll look into that. How hard is it to brake. Is it going to take all my strength to brake in a hurry or is it just a bit harder?
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muzza
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RE: Getting rid of booster
2011/03/03 18:53:45
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Brake force needed after booster removal is approximately twice. There are advantages and disadvantages. If your going to remove the booster I would recommend upgrading the brakes to a larger disc size to compensate, Bigger is always better when it comes to disc brakes.
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joeyjonsey
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RE: Getting rid of booster
2011/03/03 20:08:54
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braking effort on mine is almost standard after converting to the datsun m/c with std escort brakes all around
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razzle308
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RE: Getting rid of booster
2011/03/03 20:49:50
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ok. Are there any budget upgrades that i can do. Any disks/calipers bolt up to the escort?
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razzle308
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RE: Getting rid of booster
2011/03/03 20:51:26
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Thanks Joey, Is that the aforemetioned 120 m/c?
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joeyjonsey
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RE: Getting rid of booster
2011/03/03 20:53:28
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razzle308
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RE: Getting rid of booster
2011/03/03 20:55:57
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Noono
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RE: Getting rid of booster
2011/03/03 21:59:48
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quote:
Originally posted by muzza
Brake force needed after booster removal is approximately twice.
Yes the servo ratio from factory was 2.2:1, but I wouldn't mind betting that its nowhere near that on old Escorts with modified carburation/inlet Just did quick calcs on m/c areas Going from oe 3/4" down to 120y 11/16" increases pressure by 19% Going down to 5/8" m/c increases pressure by 44% !!! Cheers Gregg
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razzle308
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RE: Getting rid of booster
2011/03/03 22:42:57
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fahley
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RE: Getting rid of booster
2011/04/03 06:46:16
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You got a photo of the setup Joey ? Im thinking the same for my mk1.
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Paul Dunstan
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RE: Getting rid of booster
2011/04/03 07:23:10
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quote:
Originally posted by razzle308
So what m/c has 5/8 ?
5 / 8 = 0.625
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razzle308
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RE: Getting rid of booster
2011/03/08 01:22:40
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So - for the times i have operated the car without the engine running - is this what the brakes will be like - or does the booster linkage interfere with things?
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Paul Dunstan
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RE: Getting rid of booster
2011/03/08 21:49:04
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No, the pedal with the original 3/4 master would be much heavier with poor braking effort without booster vacuum. Also take into cosideration the push rod ratio between pedal and booster which also increases the pedal effort required.
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