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Author Topic:   Brake calipar mounting location
awkwardjeff
Dirt Freak

Total posts: 218
posted September 03, 2001 07:06 PM
I have been having a discussion with a few people about the location of calipars on the rear housing.
I would like to hear from a few people that build chassis or have disussed this subject with other chassis builders.
This is what we are in disagreement of, If the calipar is welded to the housing, does it make ANY differance in braking forces to the chassis if the calipar is in the rear of the housing verses being in front of the housing. Keep in mind the bracket is welded to the housing. We are talking about Z-link or 4-link rear suspension designs, in bird cages. Either rear suspension with a lift bar or pull bar. To me, because the braking forces are applied to the chassis threw the pull bar or lift bar, rotational location of the calipar to the housing would make NO differance.........But i've been wrong before, these other people believe different but can't explain how it effects the chassis.
This isn't meant to make a fool of anyone, or some trick question.........I would just like other peoples thoughts on this subject.
There is no right or wrong in this discussion, so please add your thoughts.

bbracer17
Dirt Maniac

Total posts: 168
posted September 03, 2001 07:53 PM
I'm not a chassis builder but I wondered the same thing. My car was a two link with a torque arm. I tryed the calipers both ways, in front and behind the axle but never noticed any difference on the track. At one point the left was behind and the right was in front but still didn't notice any difference.

Pickel
Dirt Freak

Total posts: 239
posted September 03, 2001 09:13 PM UIN: 25419780
I run a street stock with rear disc on leaf springs and have run the brakes both ways and never notice any difference..I have heard people say there was a difference but no one has proved it to me..

bogged
Dirt Roller

Total posts: 25
posted September 03, 2001 09:59 PM
It does not matter where the brake caliper is located on the housing. It creates a rotational force on the housing, much like a socket and ratchet, it does not matter where the handle is located becouse you get the same force. The location of the caliper on the housing should correspond to the location of the air bleeder (bleeder being the highest point).

wfoondirt
Dirt Maniac

Total posts: 142
posted September 04, 2001 12:09 AM
ditto...no diff

eagleii
Dirt Forum Racer

Total posts: 87
posted September 04, 2001 04:46 AM
I aggree with wfoondirt and bogged. No difference. I also agree with awkwardjeff that any force created will be absorbed by the pull system. And let's not forget what the dampner is for. To lessen the shock of the braking on the suspension.

I personally locate the rear calipers at a 45 deg up angle in the rear of the floater. This does get the bleeder up higher and makes it easier to work on. You can get the bolts out without the z-link or underslung getting in the way.

The only way I know for brakes to have a defined effect on the chassis is with brake floaters, but that is another subject all together.

Jerry

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EagleII

c21
Dirt Roller

Total posts: 19
posted September 04, 2001 04:44 PM
Don't think it makes a differece either, but while still keeping the bleeders basically at the top, I like to mount the left side forward and the right side high (so if there is any heat distortion it will create a little toe in and a small amount of negative camber on the right side).

wfoondirt
Dirt Maniac

Total posts: 142
posted September 04, 2001 10:43 PM
Just curious to why you would want to add toe in to the rear. Typically any toe in/out on the rear is bad with toe in being worse of the two cause the car to be darty. I realize the any change is slight anyhow but just wondering about your reasoning.

c21
Dirt Roller

Total posts: 19
posted September 05, 2001 10:10 AM
In the rear a little toe in can have an aligning/centering affect (nearly opposite the affect it has in the front). I don't persue it I just accept it as the least negative collateral damage associated with heating the left tube. Of course we are talking about applying heat so near the end of the tube that any change is unlikly anyway.

awkwardjeff
Dirt Freak

Total posts: 218
posted September 08, 2001 12:16 AM
I just want to thank eveyone that gave their thoughts. Everyone agreed with my point of view, so NOW the people I was having the discussion with believe YOU..........
We were discussing moving some suspension stuff from the front of the wheel to behind, but the brake calipar was in the way, I told them I would relocate the calipars to the front of the housing and swap them side for side to keep the bleeders on top. They claimed that would up-set the car when braking I tried to assure them it had NO effect on the chassis............Jeff

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