mcramsay
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| posted on 24/12/10 at 08:08 PM |
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new pedal box fitted but advice needed!
hey guys, i got the floor mounted pedal box yesterday and proceeded to fit it today. and i just wanted a few bits of IVA advice.
basically the footwell floor pan tapers in as you go towards the bulk head and foot well panel. because of this taper i couldnt get the pedal to go
right up against the builk head of the chassis as the box is too wide. ive bolted the pedal box down to the floor of the car in 6 places...this is the
most bolt holes i could get in the pedal...its pretty secure. however because the side of the pedal box where the master cylinders will go isnt
actually bolted up hard to anything and the floor being quite thin there is a small amount of flex if you push the box forwards (simulating pushing
the brake pedal). the movement is not excessive but there is some movement, ive thought about making up some brackets that i will weld on the chassis
and to the front face of the pedal box (where the master cylinders will mount) which will stop the box flexing forwards. would this be acceptable? if
you cant understand what i mean i will post up some pictures!
also one other thing, as each master cylinder only has one outlet obviously i have two front calipers that need a supply as reccomended in the pedal
box fitting manual i will need to use a T piece to split the one outlet into 2 outlets, one for each side. i just wanted to know if each length of
brake pipe from the T piece to each caliper must be roughly the same? or if i can have one long run of pipe (to the passenger side caliper) and one
much shorter run to the driver side caliper. If they have to be equal to do it neatly its going to be an engine out job!
[Edited on 24/12/10 by mcramsay]
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marcjagman
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| posted on 24/12/10 at 08:26 PM |
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IMHO I would say fit a brace, get the brake pipes similar length. Can't see as the pipe length will make a difference but it could look neater.
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avagolen
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| posted on 24/12/10 at 08:27 PM |
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Happy Christmas, and the good news that I can supply is that the brake pipes do not need to be of equal length.
Just run the brake pipe to the first caliper, fit a T piece and then of to the next caliper.
Len. 
The Answer for everything, but never the last word....
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britishtrident
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| posted on 24/12/10 at 08:34 PM |
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Pedal box mounting has to be as near rigid as possible, in really hard braking you can exert 150 lbf+ on the pedal (roughly 0.75kn) which will give
rise to a torque of about 110 NM.
The usually way to test a pedal box & master cylinders is to screw bleed nipples in the master cylinder outlets and bleed through the system, then
test the pedal movement by pressing the pedal as hard as possible. Any spongey movement will be down to the pedal box and pedal.
As for the length of pipe workto each caliper it is of no significance to the working of the brakes.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Richard Quinn
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| posted on 24/12/10 at 10:43 PM |
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quote:
Originally posted by britishtrident
Pedal box mounting has to be as near rigid as possible, in really hard braking you can exert 150 lbf+ on the pedal (roughly 0.75kn) which will give
rise to a torque of about 110 NM.
OK, so it's a bit of an extreme but in Webber's crash with Kovalainen in Valencia, Webber snapped off his brake pedal trying to stop the
car after the crash. Telemetry showed he exerted something between 250 and 300kg of force before the pedal snapped. Don't underestimate the
power you can exert with your legs when your life depends on it.
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