Referring to your installation post, there appear to be some differences between what you have and what we where shipped.

I did not receive a "caliper mounting bracket" for the front kit. Nor do I see a way for a caliper mounting bracket to fit.

As far as "might/could contact the inside of the rotor", in my case it is more like - will contact the inside of the rotor so that the wheel is completely locked up and doesn't rotate.

The driver's side wheel scrapes through the entire rotation of the rotor but at least it rotates. The passenger side almost seems like its warped as it contacts heavily at certain points and will not rotate by hand at all once the wheel is bolted on. So at that point, its either a fitment issue or a quality problem where they aren't checking their parts before they ship them out.

I'm not sure I feel comfortable enough to run the rotors as is on track at speed. The FD already has pad knockback issues from the wheel bearings kicking back the pads as the bearings move around. What testing has been done to determine if the rotor will contact the steering knuckle for the same reason? It seems like more of a risk with the RB kit than with other kits given those tight tolerances at the steering knuckle.

Beautiful kit but these issues are disconcerting.


Last comment. Both FDs that I've owned had the brake line mounting tabs facing forward. Both 93.

 

I think a quick poll is in order here. Could everyone please post the following info?

Year model car
Shock type/brand
Brakeline mounting tab - front or rear

I'll look at mine tonight and post back.

 

This, above everything else, is my main and very serious concern. Since it's a well-known issue that the front rotors tend to move around when the car is on sticky race tires, small clearances to the uprights are a major issue.

This is something that I personally mentioned to both Howard and Warren at RB. I just want to be clear that I'm still very excited about the kit, but I do not want to be the guy that tests whether or not the rotors will bind against the upright due to flex in the bearings/upright under hard cornering.

I am going to wait on installation until I've seen some testing that makes me feel better about this point. Again, I'm happy that there is a new brake kit for the FD, but I need to be sure that known issues with the FD have been carefully addressed.

And FWIW, my tabs face forward.

-ch

 

I had to sand 1.5 mm + 0.1mm off my rear pads in order for them to fit without shims. Anybody else have this issue?

My tabs are facing forward, but since I have Tein Coilovers too, I will rotate the shocks.


With the front rotor to caliper mounting ears, I have 2-3mm of clearance, but I wonder how much flex is seen in the system under extreme load?

 

afgmoro1978... how many of the attached pics are front, and how many rear? Shouldn't the rear operate in the same plane as the stocks did? Why would there be clearance issues in the rear (or was that JUST with the pads)?

 

The closeups are all of the front mounting ears; I did not see this issue on the rears. The only issue I've experienced in the rear are the pads being too thick. everything else is good.

 

Anyone that still have stock rotors try putting them back on and seeing how tight of a clearance it is compared to the RB setup?

 

i do.

this is with the 99 rotors

 

1994
kei office type xr
brakeline mounting tab - front

 

1993
Original Mazda shock (changing soon to coilovers)
brakeline mounting tab - front

 

From what I can see, those rotors might have a little more room between the steering knuckle then some of the RB rotors, but not much more. Anyone else agree?

 

Using a feeler gauge, I measured .008"(.2mm) clearance between the upper caliper mount & rotor and .035"(.9mm) on the lower. Clearance with a well used stock rotor is around .15"(3.8mm) measured from the lower mount. I did not try the passenger side.
How much clearance is required? I've seen 2-3mm recommended as the minimum caliper to wheel clearance. Wouldn't this be similar? If so, I have more than 5mins with a file... and would need significant convincing that removing that much material is an appropriate fix.

My Tein HA's have the brake line mounting tab on the front. Likewise for the stock '93 R1 shock.

 

My Konis have the line tabs on front.

 

Hawk HP+ pads have always fit my rear calipers perfectly with the stock rotors, and the new RB ET500 pads also fit perfectly with my new RB rear rotors.

You have a problem with your rear calipers, or maybe you are not screwing in the piston all the way in!

 

March 92 R1
stock and Tokico Illumina shocks
tabs always in front

I replaced my front EBC REDS with the ET500s which is all that RB makes for the front stock calipers. See my previous tests.
The ET500s are better than the REDS for multiple 60-0 stops as they stopped by over .1 seconds faster.
The brake feel was also better.

 

I will check the dimension's of mine and compare to a friend's FD. I made sure the piston was backed out all the way.

 

there's been discussion about the filing necessary to clear the RB rotors... i thought this might be of some help.

i pulled my caliper and rotor to give you a better idea of what has to be done. please note that you are not compromising strength here as it is just a bit of the bolt boss. notice you do not have to file the whole of the ring around the bolt, only the edge nearest the rotor.

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i have logged 700 miles on my RB system and have had no rotor/upright interference whatsoever. clearance is around 1 mm. i could have filed additional but it appears unnecessary. perhaps.... perhaps at the track i will find some contact but if i do i will just grab my file and spend another 5 minutes on it.

bottom line.... no safety issues. little work to get it done. 1.26 inch rotor.

i am still not sure as to the brakeline length. my car is a 93 VIN 669 so it is an early model. i have another set of front shocks that are the same as mine w the tab rearward. but it appears most have the tab forward which requires a longer line.

here's a 93 (early) not mine... front right shock. note R denoting right



here's a closeup of the tab



here's my right front.... note R on tab



hc

 

Thanks Howard.. Now I see what needed to be filed off.. Not too bad @ all!

 

FWIW, I just confirmed that the caliper & rotor combo is just too large to fit inside a 16-inch wheel.

I will be sending my red anodized front BBK back to Racing Beat, unless someone wants mine.

:-( neil

 

Howard, I believe the hex side of the tab faces outward. I think that 'R' shock is installed backwards on the car. Another way to think of it is that the retaining clip goes on the chassis-facing side of the tab.

-ch

 

looking at the 2 piece caliper setup howard received (well caliper and mounting bracket anyway), it would be nice if the same one piece caliper setup that the rest of us received in our kits would be [track] tested. otherwise i'm not sure that the testing would be completely valid.

from a QA standpoint, you always want to test with the same product that goes out to the public for various reasons - including legal liability.

 

FWIW, I've got the Stoptech BBK and the brake lines are not long enough to go around the front of the shock where my 94 OEM shocks and Tokico shocks had the mounting tab. I've been running Advance Design shocks for 6 years or so now with no tab and have never had a problem with the line rubbing.

With the Stoptech's brake lines, they are coated and I zip tied some rubber hose around them in case they would contact the shock. I check this every time I get under the car since last October and there are no signs of rubbing.

Jack

 

'93 R1 manufactured February '92, Koni Yellows have the tab on the front and I also believe my stock struts did.


>>>Will there be a recall on this or should I have my BBK installed as-is because I just recieved it yesterday?

Thanks
-Andy

 

We apologize for the fitment issues and all of the pre-order customers will be getting an email from us with the solutions.

 

Just to make it clear that our BBK (front and rear) requires 17" or larger wheel. They will not fit 16" wheel.