ARZ BBK customers, chime in please

Boosted Supra

Boosted Supra

AEM 7MGTE 6765
Apr 7, 2005
353
0
16
44
Valley Stream, New York, United States
UPDATE on post #37

I'm sorry if this was asked but it's bothering the crap out of me.
I have the jim king BBK and it's almost exactly the same as the ARZ kit, the only difference is believe is the fact that my rotor is 13" 1.25, his kit is 13" 1.35.

Now my question to is, how come with his kit the customers DO NOT have to pump the brake pedal at least once to get full force? I have to pump to my brakes at least once or twice to get full braking force, it's annoying the crap out of me and it's scary doing 100+mph.

Do I need to re-bleed my brakes? Change rotors? What about the direction of the rotor? I believe mine were put on wrong, here's a pic of it installed.

p1377749_1.jpg


Here's my kit before being installed

p1377749_2.jpg

p1377749_3.jpg

p1377749_4.jpg
 
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bfr1992t

bfr1992t

The quiet one
Oct 29, 2005
272
0
16
Ohio
I'm running 1.38" rotors and do not have to double pump, but I also have SL-6 calipers which have less piston surface area - much more important. It's been a while since I've looked at the ARZ kit, what calipers does it have?

Now give me your wheels to repay me for my advice!
 
atlpd3147

atlpd3147

kool member
Nov 26, 2005
485
0
16
Dacula,GA
manny talk to andy. ive mentioned that same thing to him and he advised that its the caliper. the one he uses on his kit is a more modern design. and is more matched to the master cylinder that is on the mkiii. but all the same talk to andy cause im sure he could explain it better. hope things are going well with you and the family. maybe oneday you can come and visit now that HH has made a move down here :)
 
bfr1992t

bfr1992t

The quiet one
Oct 29, 2005
272
0
16
Ohio
In basic terms it's all about piston surface area. The 4 pots that the original JDK kit used have much more piston surface area compared to the stock Toyota calipers. The SL-6's are very close to stock. You could change to lug mount SL-6's or a different 3.5" lug mount 4 pot.
 
Boosted Supra

Boosted Supra

AEM 7MGTE 6765
Apr 7, 2005
353
0
16
44
Valley Stream, New York, United States
bfr1992t;1377857 said:
In basic terms it's all about piston surface area. The 4 pots that the original JDK kit used have much more piston surface area compared to the stock Toyota calipers. The SL-6's are very close to stock. You could change to lug mount SL-6's or a different 3.5" lug mount 4 pot.
Click to expand...

So you guys are saying my Wilwood 4pot Superlite's are different from the ones ARZ is selling? I thought they were all the same? I really don't feel like spending $150 each for another set of calipers. Unless I get some to purchase my old ones.

What do you mean change lug mount?
 
rmjsupra

rmjsupra

New Member
Mar 11, 2009
143
0
0
Moorpark
www.rmjmotorsports.com
Boosted, The Wilwood Superlite is available in three different piston bore sizes, I have the same kit as bfr with the SL6.

I know that Andy uses the 1.75" piston Superlite 4-piston Wilwood. This should work fine with the stock master. If the piston bore is smaller it will cause the pedal to be firmer.

How did you bleed the wilwood's. Bleeders should faced up, start with the caliper furthest from the master, bleeder the out side bleeder first then the inside bleeder, move on the the next caliper.

If you pump the pedal and it continues to firm up you are most likely compressing air.
 
bfr1992t

bfr1992t

The quiet one
Oct 29, 2005
272
0
16
Ohio
I meant change to different calipers with smaller pistons (not nec fewer - the SL-6's are 6 much smaller pistons) that have the same 3.5" lug mount and radius.

The SL-6's aren't cheap, last I checked around 2 yrs ago they were $300 ea.

@rmjsupra - good point on bleeding and bleeder screws - make sure they're up top (caliper on proper side of car) and bled properly.
 
I

IJ.

Grumpy Old Man
Mar 30, 2005
38,728
0
0
62
I come from a land down under
Wouldn't matter what size pistons are in the calliper you shouldn't have to pump the pedal, all that's affected by piston size is force required at the pedal to stop the car.

2 things that will affect it are air in the system or runout of the disc knocking the pads back, you need 1>2 thou runout so the pads don't drag/squeak in use any more will cause pan knock and a long initial pedal.
 
rmjsupra

rmjsupra

New Member
Mar 11, 2009
143
0
0
Moorpark
www.rmjmotorsports.com
You have the staggered bore SUperlites. AZP uses the equal bore style. AZP kit offers the 1.75" bore that eqautes to 4.80 square inches of clamping force.

The Superlites you have have 4.84 square inches, the difference is not much, if it was a lot more, you would need to displace more fluid to move the much larger pistons.

In you case the overall piston area is almost the same, I think you have an issue of air in the caliper.
 
L

lzalusky

New Member
Apr 14, 2005
19
0
0
40
Sacramento CA
I installed the ARZ kit and had to pump the pedal a few times to get the brakes to work. I bled around 1.5 cans of super blue brake fluid through the system in the proper order and still it didn't feel right. Turns out my master cylinder leaked internally and let fluid past the piston. If I had someone push the brakes hard I could see fluid shoot up and hit the top of the reservoir.

Replaced the master cylinder and the brakes bled perfectly and are awesome. Just a possibility.
 
rayall01

rayall01

New Member
Oct 10, 2008
901
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67
Westfield, ma
tsuper92;1378156 said:
time for a thicker rotor.the pad's are to far away from the rotor surface
Click to expand...

That's ridiculous. The pistons in any hydraulic brake caliper will self adjust to the correct clearance. How do you think they compensate for pad and rotor wear? A slightly thinner rotor will not cause a problem like this. It's definitely air in the system.
 
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