Mk4 Roadster Rear Brakes

[Puckboy]

Hello,

Just wondering what rear brakes calipers people have with the IRS setup. As I don't really want to hack off one of the mounting points on my nice new Knuckles to install the caliper supplied by FFR, as once this is done i wont be able to put larger brakes in the future without having to replace the knuckles as well.

Mike

[DW66]

I'm running the 2015 rear brake calipers that came on my 2015 drop out rear axle assembly. If not running Wilwoods this is what I would recommend. FWIW.

Dave

[gbranham]

Hello,

Just wondering what rear brakes calipers people have with the IRS setup. As I don't really want to hack off one of the mounting points on my nice new Knuckles to install the caliper supplied by FFR, as once this is done i wont be able to put larger brakes in the future without having to replace the knuckles as well.

Mike

The portion of the spindle you remove doesn't act as a mounting point for calipers, so if you remove it, you're not limited on brake choices in the future. In fact, I started with 2018 Mustang rear calipers and rotors, but then switched to Wilwoods before I finished my build. I initially removed that portion of the spindle, and it wasn't a problem later.

[JMD]

Like Greg said, the portion of the knuckle you're removing has nothing to do with brakes except making clearance for them. The part you're removing is for a stock attachment point for another part of the suspension not used on these cars at all so you would gain nothing by keeping it.

[CraigS]

As DW66 says, the OEM rear brakes work very well. And they have a built-in parking brake. No need for a second caliper. And everyone makes pads for them since they come off a popular Mustang.

[Puckboy]

This is for the 11.65" brakes on a 2015 IRS the part I am talking about having to cut off has the red line on, i am sure this is the caliper mounting point was hopeing to just fin th correct caliper that fits with out cutting this off.
216976

[OB6]

If your wheels will allow, I would just use the 2015+ calipers with the 13" rotors and call it a day (until and if you want to go bigger). Simple bolt-up, just like the Mustang.

[gbranham]

This is for the 11.65" brakes on a 2015 IRS the part I am talking about having to cut off has the red line on, i am sure this is the caliper mounting point was hopeing to just fin th correct caliper that fits with out cutting this off.
216976

Ah yes. You are correct.

[Jeff Kleiner]

...once this is done i wont be able to put larger brakes in the future without having to replace the knuckles as well.

Mike

Why not install the larger brakes to begin with?

Jeff

[Puckboy]

Cost really, Wildwoods are way out of my budget. and with the tariffs at the boarder the price is just crazy. would like to find something i can just bolt on,

[cv2065]

Cost really, Wildwoods are way out of my budget. and with the tariffs at the boarder the price is just crazy. would like to find something i can just bolt on,

This forum is not shy about spending other people's money...:D. And along those lines, I'd highly recommend the Wilwoods. I had the Mustang brakes the first time around and they are OK, but, IMO, not as easy to work with as the Wilwoods when it comes to setup, bleed and visual appeal. And the performance of them are fantastic. If you are going to invest anywhere in a performance vehicle, it would be the braking system.

Just about everyone has blown their 'budget' around here, so join the club. :p

[Blitzboy54]

I would go with stock brakes if they are boosted. That would also solve any soft breaking issues. Either a vacuum package or hydroboost puts you close to the cost of a big brake kit though. Car does 2 things and for me stopping was top of the list.

[Puckboy]

Hi Jeff, What did you do or what would you suggest?

[Jeff_J.]

I used the Kit supplied 11.65 for my roadster & installed the forte Hydroboost for power steering and brakes, the brakes and steering work well. The routing of the ebrake cable to the caliper was not as easy with the IRS, I had to make a bracket to avoid interference. Making little brackets and adjustments are par for the course on these kits anyways. I don't track the car so I don't need an aggressive setup, I wanted PS and PB, I think with hindsight I would have considered the next size up option on the rear brakes, I think its 12". If I would have sprung for the Wilwoods (ouch) I would have skipped the Hydroboost and just installed the basic PW pump and lines. Like mentioned earlier brakes are one of those things you don't want to shortcut.

[Jeff Kleiner]

Hi Jeff, What did you do or what would you suggest?

For short money just go with the Original big 13" rotors and calipers that were used on the Mustang that the rear end is from. In my opinion unless you're doing some heavy duty track work the Wilwoods and just jewelry to make a fashion statement, but that's what some guys want (even if they aren't needed).

Jeff

[gbranham]

For short money just go with the Original big 13" rotors and calipers that were used on the Mustang that the rear end is from. In my opinion unless you're doing some heavy duty track work the Wilwoods and just jewelry to make a fashion statement, but that's what some guys want (even if they aren't needed).

Jeff

Jeff's looking at me here...hah!

Greg

[rich grsc]

For short money just go with the Original big 13" rotors and calipers that were used on the Mustang that the rear end is from. In my opinion unless you're doing some heavy duty track work the Wilwoods and just jewelry to make a fashion statement, but that's what some guys want (even if they aren't needed).

Jeff

Na,,,, open that wallet and spend till it's gone. :p

[CraigS]

Do what Jeff says.