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Nov 21, 2009 12:22:21 GMT
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I've been trying to figure this out in my head.
Are all brake servos the same or similar "strength"? What I mean is, do they all multiply the braking effort by pretty much the same amount, regardless of their diameter / application? Or are there vast differences between, say, a servo on a Focus and a servo on a Bimmer 7-Series?
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Nov 21, 2009 12:38:19 GMT
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big servo, more help due to internal surface area, the master cylinder has more effect on how they actually work though.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Nov 21, 2009 13:58:25 GMT
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as popup has said, its more down to the diameter of the internal piston on the braje master cylinder as to how much fluid/hydraulic pressure is created. obviously this bit only bolts on to a servo so if you could find one of a similiar size that your master cylinder would sit on and the pushrod etc was ok then I would think it would work ina similiar manner,.. obviously putting a bigger one on would help brake effort
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Nov 21, 2009 14:12:42 GMT
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Thanks guys, I knew I could get a good answer here!  I'm just considering my options regarding servos - I may still be able to squeeze the original one in, but I didn't want to end up with curse word brakes on something with so much power! ;D |
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Nov 21, 2009 20:44:54 GMT
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www.uk-hotrods.co.uk/v2/tech/brakes/brakes.phpwww.uk-hotrods.co.uk/v2/tech/brakes/brakes_part_2.phpPower provided by servo is in direct proportion to size of servo diaphragm ( atmospheric pressure at 14.7psi ) . Overall power is decided by pedal ratio x bore of m/c x servo assist amount. When mounting adapting different m/c to servos you have to ensure that there is 1mm free play internally between the internal pushrod and the m/c . No free play and you will have brakes sticking on , too much and multiplied by pedal ratio you'll gain that much free travel before the m/c starts to work. How big is your current m/c and diameter of servo ? I'm taking it that it's 4 wheel discs ?
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Last Edit: Nov 21, 2009 20:46:13 GMT by kapri
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Nov 21, 2009 21:37:49 GMT
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Great links and advice, aceadvice! Thankyou! I don't recall the diameter of the servo... it's a big 'un though, and it is discs all round, yes. ATE system. I'm also concerned that if I change and brake components it may send me into BIVA territory... I'm building my car to avoid such things so I always have one eye on the points! |
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Nov 21, 2009 21:48:20 GMT
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Glad to help ;D
Changing brakes doesn't lose you any points on the 8 points system.
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Nov 21, 2009 21:57:29 GMT
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but I didn't want to end up with curse word brakes on something with so much power! ;D It won't affect the braking performance,it'll just mean you have to push harder. |
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Nov 21, 2009 22:06:33 GMT
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Not neccessarily true, especially with all discs. Due to the size of the m/c needed you will struggle to make enough line pressure without a servo. Ever tried stopping an all disc motor with servo failure ? I've been out the seat with both feet on the pedal and pulling on the steering wheel on a Mk 4 Zodiac in the past!!
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Last Edit: Nov 21, 2009 22:07:37 GMT by kapri
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Nov 21, 2009 22:58:39 GMT
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No loss of points? Even better! I can play about at will then! To be honest I'm loathe to set myself yet another set of problems to solve with this build, so I'm hoping I can put the original one back. I won't know until I get the engine propely bolted in though. Thanks again for all the advice / info everyone!  |
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Last Edit: Nov 21, 2009 22:59:08 GMT by BenzBoy
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