MM,
I agree with Jay to look into this more.
Some steps:
1) If you cannot get a consistent hard pedal upon bleeding in the shop-you
have defective parts or poor bleeding technique.
2) If your brakes still stay hard on the first stomp after leaving the car
sit for several weeks, then pad knock back or driving technique is more
likely to be the problem than leaky lines or cylinders.
You can use a dial indicator or even a pencil clamped on to something solid
to see if you have a lot of runout on your rotors.
3) If during the race, the pedal is OK on the grid, but it gets worse the
more you drive, you probably need to get your foot off the brake pedal-you
are oveheating the fluid. Common 2 pedal driver technique problem.
Chuck
From: "Jay Novak" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: [F500] Pumping the Brakes
Date: Sun, 22 Apr 2007 20:34:24 -0400
IMHO it is NEVER acceptable to have brakes that must be pumped to get them
hard. Your safety is the issue. Figure out what is wrong & fix it. It
sounds like excessive knock back to me.
Our F500s NEVER require that the brakes be pumped even after a 20 lap race.
Thanks ... Jay Novak
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Richard Schmidt
Sent: Sunday, April 22, 2007 7:12 PM
To: [email protected]
Subject: Re: [F500] Pumping the Brakes
I see nothing wrong with the way your brakes are working. You don't say if
you are road racing or autocrossing. In autrocross, this maybe a problem,
but for road racing, to have the pads back up a bit is a good thing. Less
drag, more top speed.
I always pump the brakes a couple times as I approach a corner with my
right
foot firmly planted to the throttle stop. (WOT) At the right moment, left
foot down, right foot up. ZZooomM.
Richard
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, April 21, 2007 7:13 AM
Subject: Re: [F500] Pumping the Brakes
> In a message dated 4/21/2007 5:46:23 A.M. Eastern Daylight Time,
> [EMAIL PROTECTED] writes:
>
> <<<So my understanding is that if you need to pump the brakes to get
good
> stopping power, the first thing to check is bleeding the system. If
that
> doesn't help, is there anything else I should be looking into, or just
keep trying
> to perfect my bleeding technique?>>>
>
>
> The other most-likely reason for needing to pump the brakes is that the
pads
> are getting pushed back into the caliper, away from the disk. This can
be
> caused by several things; warped rotors, bad bearings, axle flex, loose
> caliper mount, sticking caliper slide, etc. If the second pump is firm,
this is
> the issue. Normally, if the brakes need bleeding due to air in the
lines
or
> bad fluid, the pedal will feel soft even after you've started to get
brake
> action.
>
> I've found that even in the best-prepped cars, I'll tap the brakes once
> lightly towards the end of the long straights to get the pads pushed
back
closer
> to the rotors, which will eliminate excessive pedal travel. If you've
ever
> watched in-car footage of the top road racers, they all do this.
However,
if
> you have excessive pedal travel, you need to find out where the system
is
> moving and get it tied down.
>
> MM
>
>
>
>
>
>
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FormulaCar Magazine - A Proud Supporter of Formula 500
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________________________________
FormulaCar Magazine - A Proud Supporter of Formula 500
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Subscribe Today! www.formulacarmag.com or 519-624-2003
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