Mis-matched Pads Front/rear

[Primordial]

I've been told that QFM pads are good for normal street use, so i'm getting a set of these as they are relatively cheap.

I have a track day coming up though, and I thought of getting some RB74's for the fronts. I can't afford DS2500's at the moment so these will have to do. Will having RB74's on the front and QFM on the rears cause any problems? I've heard on the grape vine that it may cause some understeer. Is this true?

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I've been told that bendix ultimate are very harsh on the rotors, and give a ridiculous amount of dust. I was recommended the QFM's instead. Supposedly they were co-designed with one of the guys from Racebrakes. Does anyone know whether they are good for spirited street driving?

[warriorbrawl]

Yeah a Friend of mine had the qfm pads on his modified WRX and we were at a track day they seemed to go really well. He was happy.

I think those guys can make a number of different compounds for their pads depending on the application.

My friend's were just the standard sort of pad they offer.

They are cheap too.

let us know how you go... no great loss if they are no good I guess.

[Primordial]

Cool! Thanks for the reply.

I'm getting a set of RB74's so I'll run them in the front, and the QFM's on the rear and see what happens!

I'll post the result after the day (July 2nd)

[djr81]

I have a track day coming up though, and I thought of getting some RB74's for the fronts. I can't afford DS2500's at the moment so these will have to do. Will having RB74's on the front and QFM on the rears cause any problems? I've heard on the grape vine that it may cause some understeer. Is this true?

Um, unless you are getting pineappled for the price of the DS2500's, they should only be $80 more than the RB74's or thereabouts. How much are you paying?

You need to make sure that the friction coefficients of the front pads matched that of the rear pads.

Understeer? No. What an imbalance can do is make either the front or rear brakes lock prematurely & degrade your overall braking performance.

I've been told that bendix ultimate are very harsh on the rotors, and give a ridiculous amount of dust. I was recommended the QFM's instead. Supposedly they were co-designed with one of the guys from Racebrakes. Does anyone know whether they are good for spirited street driving?

Dusty, yes. Harsh, no. (Compared to what?)

If racebrakes recommend them they are probably pretty good.

[Primordial]

Well I must be getting ripped off for the DS2500's then.. $245 for a front pair.

I can get the RB74's for $120!! Screw paying twice the price for something that's surely not going to go twice the amount of time before overheating!

[Primordial]

Understeer? No. What an imbalance can do is make either the front or rear brakes lock prematurely & degrade your overall braking performance.

hmmm.. ok then... i might have to get RB74's for the back as well.. I might buy some and see how I go at the beginning of the day... If it's causing problems i'll swap them over.

Dusty, yes. Harsh, no. (Compared to what?)

If racebrakes recommend them they are probably pretty good.

Well I've heard a few opinions that said that they are harsh for what they are. ie. not that good when it comes to track situations (heat wise), but still just as harsh on the rotors as a more high performace pad.

[djr81]

Well I must be getting ripped off for the DS2500's then.. $245 for a front pair.

I can get the RB74's for $120!! Screw paying twice the price for something that's surely not going to go twice the amount of time before overheating!

You are getting the RB74's at a really good price...

hmmm.. ok then... i might have to get RB74's for the back as well.. I might buy some and see how I go at the beginning of the day... If it's causing problems i'll swap them over.

You don't need RB74's for the back. Racebrakes usually just tell you to use a Bendix Ultimate pad or similar as the back brakes don't really do much & you don't need a pad that deals with high temps. If the friction coefficients of what you have matches the RB74's I would be very tempted to leave them alone.

More important than pads is good fluid. So get some Motul RBF600 or equivalent.

[Primordial]

Yeah I'm getting the RB74's through BDA http://www.brakedistributors.com.au/

The reason they're so cheap is I'm able to get them for trade, which is handy!

Yeah I've heard that before about the fluid - I had Motul 5.1 in there for the last track day and it was good, although I had crap pads on there so the little fade that I had may have just been because of them. Do you know if the RBF600 is much more expensive than the 5.1?

-- Edit: ignore that last question... I've just found it's just under twice the price http://www.uniqueautosports.com.au/priceli...elist_motul.htm

Fair enough.. I might give it a go this time around!

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Anyway thanks heaps for the info DJR - Very helpful!

[Roy]

Im interested in trying some DS2500s on the front of my car. I have used RB74 fronts with comp 2 rears, but more recently Comp 9 fronts with the Comp 2 rears.

Have always been happy with them, but ppl keeping touching themsleves over the DS2500s so want to give them a try. Only woudl like to hear from ppl that have used them and hear what rear pad they think works well.

I have 324mm front rotors on my car, and have found the Comp 9 - 2 mix to work really well....so want to be sure the $500 odd im about to spend will be markedly better and not cause bias issues.

[GTRgeoff]

Roy's getting wet. He loves brake discussions........

[Roy]

Actually, the thought of driving my car in 12 months is pumping up my tyres. The thought if hitting the track to find that trialling different pads ruins my fun is not so appealing

[someonestolecc]

Actually, the thought of driving my car in 12 months is pumping up my tyres. The thought if hitting the track to find that trialling different pads ruins my fun is not so appealing

ot but why is your car off the road?

[Roy]

The car was falling apart around the engine...so body work

[someonestolecc]

The car was falling apart around the engine...so body work

... from racing?

[Roy]

Mishap #1 , small under bonnet fire at Winton

Mishap #2 , kissed tyres at drift day

Mishap #3 , kissed tyres at Eastern Creek in the wet...so it was time to pull it off and clean it up...not really racing, its just that i cant drive

[GTRgeoff]

NOT that you can't drive, just driving on the other side of the razors edge

[gtr fan]

What are these DS2500's (sorry moving out from underneath my rock tonight)!

I have just been pricing up EBC redstuff for my 32 GTR at around $250 per end? Are these DS2500'S any better?

The car is just a weekend car (if that) and I am after a track suitable pad.

[T04GTR]

mismatching pads is an easy way to compinsate instead of a bias adjusater

[Roy]

NOT that you can't drive, just driving on the other side of the razors edge

Nope. Its just that i cant drive...i have excuses of course, but a better drive wouldnt have binned his car

Im about to go for DS2500s front, but dont know abotu rears????