QFM HPX Brake Pad review.

[Tsunamix]

I've had these pads in for about 2 weeks now. I installed them with a full set of New slotted calipers so It's a completeley new wearing set of brakes.

Couple of notes - when reinstalling the calipers on the guide bolts, lube them with a bit of running in compund or similair. It enables the calipers to slide freely under hydraulic pressure, gives you a better pedal feel during travel. I found this out Afterwards.

These pads seem dustless. If there not there very close. There definitley a performance pad, they need a lil bit of heat to perform at there best. Pedal travel is shorter than you'd expect with the standard spongey (you can continue to push the pedal for no extra braking effect) VT Brake system. Control during stops is very high, and I found it easy to find the 'edge' of engaging ABS and hold the deceleration on that edge during high speed stops. Pedal effort required is - as can be expected from a HP pad - More than normal. There is a definite wooden feel to the system (not just the pad) that was apparrent even when using standard pads. Maybe braided brake lines will remove some of that woodness, or maybe I need a new master cylinder. Pedal feel is great, very progressive. Applying exactly the braking effort you want is easy - if the pads have a little heat in them. At cold there effective, but shift from 'a little greasy' to 'a little grabby' quite quickly.

Distance traveled - 1200KM
Rotors - Slotted GDA
Car - VT Auto sedan 1999 245K KM
Overrall rating 8/10.

Use with confidence. I suspect that standard rotors will be a little greasy feeling with these. Go for slotteds of High quality, or better.

[Jesterarts]

Yell reviewed...

I got slotted rotors on the front and QFM pasd in my e30...

Very happy with the performance... And very very little dust.

[Tsunamix]

Now out to about 3000 Km, and since the rotors have polished up, things have changed a little. At dead cold, the pads are a little slippery. this is to be expected for what is a performance pad. You need to ebar it in mind when driving though.

the pads prove noiseless, almost totally dustless and don't seem to suffer much from water or water contamination. braking in the wet feels identical to in the dry, which I find amazing.

Good Pads.

[gslrallysport]

At dead cold, the pads are a little slippery. this is to be expected for what is a performance pad. You need to ebar it in mind when driving though.

That's really weird. The HPX has near identical cold and hot friction co-ef's so generally you don't get that, and I can't say with the HPX in my Cross 6 personally that I've experienced anything that needs you to bear in mind that they're performance pads. The Cross 6 has got bigger rotors though... Thanks for the feedback!

[Jesterarts]

Ok... really put the pads and rotors through their paces... along the twisties through the dandenongs...

DAMN!! so happy....

No brake fade at all... they were right there when i needed them each and every time!!!

So glad i got them!!

Thanks again gslrallysport!

PS. Once again... no brake dust...

[padrickz88]

So what are they like cold? i know with one's like bendix ultimates they are apparently shitty when cold and need a couple hard brakes to bring them up to normal using conditions (if that makes sense?)

Are these like that? or are they the same cold and hot?

[gslrallysport]

or are they the same cold and hot?

They're exactly the same hot/cold. 0.41 vs 0.42

Something like a Bendix Ultimate (or even EBC Green) is around the mid 0.35's when cold, that's why they have that reputation, nothing like that for the HPX!

[Jesterarts]

^^ As gslrallysport said... the feel the same cold as hot...

Only difference is mine a bit squeaky when they have been working alot...

Very good product...

[Tsunamix]

Hi guys,

I notice that the QFM advertise a friction range (0.43 - 0.42) and a heat range - (0-550 degrees). Nothing seems to say that the coeffeciciont of friction at 0 is the same as at 550, just that the coefficient doesn't drop off much.

At dead cold - from my experience - these pads need a little more effort to get the same retardation. By stop # 3 though, there in their element.

My rotors arent glazed, in fact they still look mint, so I'm guessing it's the pad. Of course, being a naked steel element, the rotor 'could' be coated in condensation - yes the car lives outside in Queensland - a very humid place.

I don't think I'd put them in my nana's car - but they certainly go in my dad's.

Cheers

Andrew

[gslrallysport]

Andrew,

I have to say mate that that goes against everything that either customers have reported on, or that we've personally experience in our cars. There's no difference between them hot and cold, and the friction co-ef of 0.41 when dead cold, is more than most taxi pads will work at when hot. Depending on the application, sometimes the A1RM can be a bit dull first bite out, but that's not something I'd associate with the HPX.

If you reckon your rotors are fine, then I'd be looking elsewhere, and if it's not fluid, then it could be the rubber line. VT2 is getting fairly old now, over a decade, and if it's still the original lines then I'd be inclined to replace them. I know it may not have happened on previous pads, but pads which are typically very aggressive (which the HPX isn't) will often mask inadequacies in other areas of the braking, like lines or fluid.

When QFM say Cold 0.41 and Hot 0.42, that is the hot to cold range. Nothing to do with drop off. To get the drop off range you need ALOT more figures than that. That 0.41 is at zero, and the 0.42 is at 550.

I'm just concerned that if you say you wouldn't put them in your nana's car that there's another underlying issue with your brake system that needs to be looked at, because as most people here will attest to, cold to hot they're exactly the same. Oddly enough the ONLY other person who I can honestly say has ever mentioned something alone the same lines also owned a VT, but bought a set of HPX for his Jackaroo at the same time, and said in the Jackaroo they were exactly the same cold/hot, but was perplexed as to why they felt the way they did in the VT. So it may be VT related.

I'd be inspecting the lines and the master cylinder return valve. Even at dead cold with a co-ef of 0.41, that's better than most taxi pads will work at throughout their entire temp range, so if they're not working from cold, then there's possibly another underlying issue. What pads were you running previously?

Cheers,
Greg

[Johnbear]

this is to be expected for what is a performance pad. You need to ebar it in mind when driving though.






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