Xflow front Brake pads

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auyt
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Xflow front Brake pads

I use my car mainly for road use however recently on a spirited down hill mountain pass run the fronts lost most of their grip. They came good once cooled. 
The brakes at the front are all new with slotted rotors, I'm not sure what the pads sorry, are but they obviously not up to my occasional mountain run.

some reasurch suggests DS2500 but that was a few years ago has what have others found?

SM25T
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How old is the fluid ? Any water in it will migrate down to the calipers and boil when hot. Should ideally be replaced every 2-3 years. Very easy to do. Makes a big difference.
auyt
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The fluid is only 12 months old as I had rebuilt the calipers and replaced all the flex lines with Caterham braided hoses.

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Jonathan Kay
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elie boone
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Mintex M 1144 works fine on std calipers, your slotted disc's will surely help cooling but if the mountain pass has a lot of hairpins then it might be a case that the system overheats due to the lack of airflow that would cool the disc and caliper.

vented rotors with 4 pot calipers would possible be the cure and then you have 2 options, the heavy and more expensive one is CC, the lighter and with much better pedal feel and also cheaper option is Hi-Spec. for this later option i have the parts codes ( disc,rotor,alloy bell ) for a plug and play system.

auyt
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Jonathan thanks for the link.

elie , the mintex are also of interest. And the upgraded brakes are definitely a consideration and something to investigate further.

The passes (4) near me are have short distances between tight turns, huge fun but busy the YouTube videos don't do it justice.

 

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7 wonders of th...
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So your front discs are 9" with grooves machines into the surface ?

Calipers stock cast iron 2 piston (Triumph spitfire)  ?

Is your car De Dion with the Sirerra calipers on the rear or live axle with drums..?

 

 

auyt
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So your front discs are 9" with grooves machines into the surface  yes

Calipers stock cast iron 2 piston (Triumph spitfire)  yes

 live axle with drums..yes

and one other thing a bake booster on the front, I didn't fit it but the brake balance seems to work.

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7 wonders of th...
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Are you meaning an indirect servo ...? are you sure its only on the fornt brake line..?

Is your master cylinder a tandem version ?

auyt
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Yep inline V45, lives in front of the pedal box (RHD) , yes tracked all the lines and yes definitely only fronts, and it's only boosts the front line from a tandem master.
I did consider removing it but I figured Id try it before removing it. And it only puts in a small amount of boost, and it could have been installed due th brake balance being out and I also learnt a lady used to drive the car and I can only gather it was at here request.

It could be depriving the force to the rear and hence the fronts are getting hotter than they should, food for thought. Might try taking the vacuumed off and doing some test brakes, to see it the rear lock first. 

 

 

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7 wonders of th...
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The rears are doing little at the moment which is why your fronts are fading, due to the location of the driver and therefore rear axle loading the rears normally do a significant amount of work.

Take it off, check the rears are still in good working order and haven't partially siezed through lack of use (drums off etc) and re evaluate.

We can go from there....