bigandy
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| posted on 21/11/06 at 02:17 PM |
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Brake pedal return springs..
Afternoon all,
I've just been checking the braking system on my car before I bite the bullet and fill it up with fluid, and I've noticed that I
haven't fitted a pedal return spring on the brake or clutch pedals (both wilwood remote rervoir master cylinders, with a bias bar on the
brakes).
Is it generally recommended to fit some kind of return spring on these pedals, or is it acceptable to rely on hydraulic pressure, or the master
cylinders to retunr the pedal to the top of its travel?
My gut feeling is that it would be a wise idea to fit a return spring, if only to minimise any residual pressure in the system due to friction and the
pedal weight.
Which brings me on to my next question, what sort of force would you want to return the cylinder actuation arm (so I can work out the spring rate
required)?
Finally, does anyone know a good source of extension springs, roughly 50-55mm long no load, and extending a maximum of about 12.5mm. The end can be a
simple hook, or a loop.
Cheers
Andy
Dammit! Too many decisions....
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mookaloid
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| posted on 21/11/06 at 02:26 PM |
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Mine has no return springs and it is fine
"That thing you're thinking - it wont be that."
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DIY Si
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| posted on 21/11/06 at 02:31 PM |
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None here either.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Big Daz
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| posted on 21/11/06 at 03:27 PM |
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I have fitted one to the throttle pedal just to help the cable and take up any slack, brake - none fitted and clutch is a solid bar arrangement so no
spring needed there either
Daz
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andrews_45
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| posted on 21/11/06 at 04:45 PM |
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nah, you wont need one on the brake pedal
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JB
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| posted on 21/11/06 at 05:31 PM |
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None here either on the clutch and brake.
John
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02GF74
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| posted on 22/11/06 at 08:58 AM |
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the springs within the master should be strong enough to push the piston fully out; there should be a bit of slack 1 or 2 mm before the pedal acts on
the rod; if not, if you have that then no need for spring but ofcourse fitting one isn't going to hurt.
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Peteff
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| posted on 22/11/06 at 11:45 AM |
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I have a modified Mk2 Escort pedal setup and installed the spring in it's original location on the clutch and brake pedal. I have used the brake
without the spring installed and it doesn't return as quickly so I think it's better with one fitted. I used the one that was on the pedal
but the spring rate shouldn't be critical as long as it does the job.
 
Top mount pedals.
[Edited on 22/11/06 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Chazzy
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| posted on 23/11/06 at 11:01 PM |
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the pressure in the brake system will return the pedal. if the pressure is enogh to push small pads onto the discs/shoes and stop a car, it will be
enough to return the pedal to upright. remember it pushes back with the same force that YOU apply to it. (ignoring small resultant force to accelerate
the movement of the pedal for the pedants out there ;-) )
ditto with clutch pedal, how strong are the clutch plate springs?
you might want to put a stop on the return movement so the pedals don't fall down (if bottom hinged)
my accelerator pedal has an extra return spring in case the one on the carbs breaks.
Chas
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Peteff
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| posted on 24/11/06 at 12:34 AM |
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remember it pushes back with the same force that YOU apply to it.
Why does it? The only thing that pushes it back is the spring in the master cylinder and the shoe springs and caliper seals after the fluid is back to
it's normal state. Every action has an opposite and equal reaction doesn't apply as the reaction is the force applied to the brake disks
and drums.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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C10CoryM
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| posted on 24/11/06 at 03:27 AM |
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I would highly recommend adding brake return spring to the pedal. There has been a couple times where I have lost brake pressure, and had to pump
like crazy to get stopped. If there had been no pedal return spring I would have not been able to pump it up enough to get stopped. Boil the brake
fluid at the track or blow a seal and you NEED that spring.
Cheers.
"Our watchword evermore shall be: The Maple Leaf Forever!"
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