NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   Rebuilding 4-pot Brakes (https://www.nopistons.com/2nd-generation-specific-17/rebuilding-4-pot-brakes-60211/)

Dysfnctnl85 06-26-2006 03:22 PM

I pulled these guys off a 5lug FC sitting in a junkyard and proceeded to rebuild them. I *thought* I had all the parts I needed but something appears to be wrong. Did I forget something? It doesn't seem like anything will keep the brake pads separated.



I did notice that I only had one v-clip per caliper, but they connect on the top, so the pads rub together on the bottom. Can someone point out what I did wrong?



https://img.photobucket.com/albums/v...5/c6f34207.jpg



https://img.photobucket.com/albums/v...5/c02ed9ef.jpg

nismo convert 06-26-2006 06:24 PM

Where is supposed to be a different spring to spread them, a larger one.

fc3s4utnv 06-26-2006 08:59 PM

The rotor holds them apart at the bottom.

cymfc3s 06-26-2006 09:31 PM

thats correct. Its not supposed to move the brake pads, but keep enough pressure on them to draw them away from the rotor.

Dysfnctnl85 06-26-2006 09:57 PM


Originally Posted by cymfc3s' post='826237' date='Jun 26 2006, 10:31 PM

thats correct. Its not supposed to move the brake pads, but keep enough pressure on them to draw them away from the rotor.



So, in other words, it looks okay? I don't have my rotors in yet but I did *try* to put the caliper on the rotors that I took off the junker and boy was that a chore. I'm thinking they're going to scrape like mad! The only other thing it could be is that the pistons aren't seated fully in the caliper and that with the introduction of brake fluid they will recede...

1988RedT2 06-27-2006 05:33 AM

I have known other disc brake designs to not have any spring to separate the pads.

Dysfnctnl85 06-27-2006 06:37 AM


Originally Posted by 1988RedT2' post='826257' date='Jun 27 2006, 06:33 AM

I have known other disc brake designs to not have any spring to separate the pads.



I didn't mention that I don't have a lot of experience with brakes, but I guess that was pretty obvious.



Thanks for the response!

Stanello 06-27-2006 06:09 PM

If I recall correctly, I only used 1 v-clip per side. I've had no ill effects yet and I did the brakes over a year ago.

fc3s4utnv 06-27-2006 06:39 PM

To sum it up, you did a good job, dont worry, as long as you dont have any left over parts dont worry about it.

Dysfnctnl85 06-27-2006 07:51 PM


Originally Posted by White87FC' post='826356 (Post 734101)
To sum it up, you did a good job, dont worry, as long as you dont have any left over parts dont worry about it.



Thanks for the feedback. I wish there was a way to mod people on here, because without advice from people like you I would be totally lost in this project of mine!

toplessFC3Sman 06-28-2006 10:10 AM

yea, they look good to me. the v-spring is just meant to pull the pads away from the rotor after you finish braking, just to provide a little spacing. You will need to recess the pistons before you can really slide them over the rotors. The front pistons can be forced back with a clamp or something of that nature, but the rears you will need to take a pair of needle-nose pliers and twist the piston head clockwise to make it draw back. it can be a real PITA.



Also, make sure that the little spring-wire that retains the pins thru the calipers is in good shape. I had mine break while driving and one of the pins worked its way out... really fucked itself up bad on the rim, and scraped the rim up a bit too. Overall not a good thing.

Dysfnctnl85 06-28-2006 02:48 PM


Originally Posted by toplessFC3Sman' post='826457' date='Jun 28 2006, 11:10 AM

yea, they look good to me. the v-spring is just meant to pull the pads away from the rotor after you finish braking, just to provide a little spacing. You will need to recess the pistons before you can really slide them over the rotors. The front pistons can be forced back with a clamp or something of that nature, but the rears you will need to take a pair of needle-nose pliers and twist the piston head clockwise to make it draw back. it can be a real PITA.



Also, make sure that the little spring-wire that retains the pins thru the calipers is in good shape. I had mine break while driving and one of the pins worked its way out... really fucked itself up bad on the rim, and scraped the rim up a bit too. Overall not a good thing.



Ah yes, I ordered all new hardware so those particular springs are brand-spankin' new. Thanks for the heads-up.

fc3s4utnv 06-28-2006 02:55 PM


Originally Posted by toplessFC3Sman' post='826457' date='Jun 28 2006, 09:10 AM

yea, they look good to me. the v-spring is just meant to pull the pads away from the rotor after you finish braking, just to provide a little spacing. You will need to recess the pistons before you can really slide them over the rotors. The front pistons can be forced back with a clamp or something of that nature, but the rears you will need to take a pair of needle-nose pliers and twist the piston head clockwise to make it draw back. it can be a real PITA.



Also, make sure that the little spring-wire that retains the pins thru the calipers is in good shape. I had mine break while driving and one of the pins worked its way out... really fucked itself up bad on the rim, and scraped the rim up a bit too. Overall not a good thing.

Don't use needle nose, go buy the 10 dollar tool to do it right.

Stanello 06-28-2006 03:18 PM

Yes, I found it impossible to get the rear pistons back in without the little rubix cube tool.

fc3s4utnv 06-28-2006 05:39 PM

I got mine the first time to my fingers disapointment.

toplessFC3Sman 06-28-2006 10:34 PM

they make a tool for it? damn, wish i knew... altho i doubt i would have gotten it since i have a trusty pair of needle-nose pliers, and like an extra $10 in my pocket

j9fd3s 06-29-2006 08:40 AM


Originally Posted by toplessFC3Sman' post='826457' date='Jun 28 2006, 08:10 AM

Also, make sure that the little spring-wire that retains the pins thru the calipers is in good shape. I had mine break while driving and one of the pins worked its way out... really fucked itself up bad on the rim, and scraped the rim up a bit too. Overall not a good thing.



yep had that happen too, the rim looses.

fc3s4utnv 07-05-2006 06:31 AM


Originally Posted by toplessFC3Sman' post='826564' date='Jun 28 2006, 09:34 PM

they make a tool for it? damn, wish i knew... altho i doubt i would have gotten it since i have a trusty pair of needle-nose pliers, and like an extra $10 in my pocket

Yeah Autozone or any parts store should have one.


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