95ONE

Eclou. - Gene - I can bleed your brakes tonight while its on the lift. Please bring your preferred brake fluid.

333pg333

When people are saying that the BR have larger caliper pistons than the normal 951 brakes, we must be careful what we say are the normal ones. Anyone with Mo30 option will have the S4 calipers and they have the same piston area as the BRs so in theory the stock m/c should do the job.

Oh, and I had a rock hard pedal the other day after bleeding and putting in the Pagid Blacks all round. Yesterday at the track it got a little mushy at times. I didn't have any fade, but the pedal on the road is pretty damn good now so why is it still getting a little soft at the track? Heat of course but I was only doing pretty short sessions of maybe 8-12 laps. It's roughly a 1.50 track with 12 turns.

Mike Lindsey

BR and BB are not a racing caliper. They are a street caliper. A brake kit with a true racing caliper is going to be twice the money and most 951'ers won't spend the money. They discolor, the seals degrade quickly, and the dust boost can burst into flames. Mushy pedal can be a fluid, rotor, caliper flex or pad issues.

333pg333

That's true enough, but then you have BRs on your race car and so do a lot of others. So I guess you just have to do the best you can with what you've got. A proper race setup will cost more than 2wice what I have for sure. Probably 3-4 times.

Rich Sandor

So then how are the BR/BB's bigger than the S4's? Are the pistons just placed farther apart to accomodate larger pads?

What kind of fluid are you using and what kind of cooling do you have? Also what track is it? Some tracks are harder on brakes than others.

I've been told that the biggest difference between a street caliper vs a true racing caliper is that the racing calipers have titanium retaining plates. Apparently Brembo specifically says that the road based calipers are not to be used for racing. Although, I'm pretty sure that the original 944 turbo cups used the same brake calipers and retaining plates as the street production 951's did. I'd be surprised if anyone had any catastrophic brake failures with street BR/BB's considering they are way bigger than the OEM baby brembos on the non-m030 951s. Even with the non-titanium plates and street seals/dust boots they should run way way way cooler than the stock brakes.

333pg333

The pad area is just bigger. I'm not sure if the spacing of the pistons is too different. Probably not. The biggest jump up in size is the pad area, but some have contended that this is superfluous due to the pad being deeper and therefore closer to the hub which may or may not be somewhat ineffectual. It may not be ironic that Porsche never had another setup like this again. Although they probably just shifted to the Monoblock design which was superior so that may be coincidental also.

My setup is BRs front, S4 rears on the rear (not S4 fronts on the rear which some have done) s/s lines, tube ducted rotor cooling, 322mm drilled rotors front-solids rear, SRF fluid, 5/33 bv, Pagid Blacks (but may move back to the PFCs).
I'm about to go to work and I bet my pedal is solid. Sometimes I have to double pump on the street but after the latest bleed they do feel solid on the street, but they still got soft yesterday at the track. The track is in Sydney, Australia. It has a variety of turns and there are some high pressure braking points.

TonyG

Just as a data point:

While I'm not an expert on BR/BB and their acceptable use as a racing caliper, out here in Southern California, they are used in pretty serious racing with the POC on a regular basis (on a variety of tracks). I've never seen nor heard of one failing. These include the standard 951 caliper, S4, and BR/BB calipers.

TonyG


TonyG

TonyG

Just as a data point:

While I'm not an expert on BR/BB and their acceptable use as a racing caliper, out here in Southern California, they are used in pretty serious racing with the POC on a regular basis (on a variety of tracks). I've never seen nor heard of one failing. These include the standard 951 caliper, S4, and BR/BB calipers.

TonyG


TonyG

333pg333

I'm trying to find some of that (currently in my case orange) tube ducting for my brakes. I could only find what looked to be 2.5" tubing on Paragon. I'm sure mine is at least 3".

eclou

smartracingproducts.com

Rich Sandor

http://www.pegasusautoracing.com/
http://www.racerpartswholesale.com/
http://www.hrpworld.com/
http://www.smartracingproducts.com/

333pg333

Thanks.

Van

There was a good thread in the Racing forum about the differences between S4, big blacks and big reds (including rotor thickness and diameter). I can't seem to find the search feature, otherwise I'd post the link...

Paseb

any good place that sells big red calipers rebuild kit?

Bri Bro

They stuck this at the top of the page.

ATTENTION: Due to server maintenance work - search functionality will be disrupted until Thursday morning.