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Brake Fade With 7.5" S Disc Conversion


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#16 Midas Mk1

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Posted 18 December 2020 - 08:10 PM

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 


Edited by Midas Mk1, 18 December 2020 - 08:22 PM.


#17 sonikk4

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Posted 18 December 2020 - 08:37 PM

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 

 

Not living in the dark ages, just not having any issues with them. Also it depends on what you doing with the car.

 

When i fit my new engine i will upgrade the pads but my original 998 the pads were more than good enough.

 

Each to their own.



#18 Cooperman

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Posted 18 December 2020 - 09:14 PM

Mintex 1144 are very good indeed and the vast majority of owners would never manage to fade them. For really aggresive use they can fade as they have done on my 'S', which has 7.5" discs, of course, but I have switched to the Carbon-Metallic ones as sold by Mini Spared. they are simply fantastic and work well from cold.

I have never managed to fade them, although I do use AP600 brake fluid (or its equivalent). The only risk with a C-M pad is that DOT4 brake fluid will boil before the pads fade. I have seen my discs literally glowing red after a special stage, but no fade at all.



#19 unburntfuelinthemorning

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Posted 18 December 2020 - 10:03 PM

What year is the Mini, and what wheels do you have, and perhaps an upgrade of Pad to EMC

 

 

It's a '79.  The "Greenstuff" brakes should help but I would have expected better performance from the supplied pads in the kit.



#20 unburntfuelinthemorning

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Posted 18 December 2020 - 10:06 PM

Pad and brake fluid upgrade would be my first route.

As above I expected better performance from the supplied pads.  Fluid is DOT 4  which should be quite sufficient for the job and was completely renewed recently.  It isn't the fluid boiling anyway as I still had a solid pedal when the fade occured.



#21 unburntfuelinthemorning

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Posted 18 December 2020 - 10:08 PM

Have you bed the pads in?

Have you re-bled them since installing?

Yes I bedded the brakes in before attempting to use them more firmly.  I haven't re-bled them but haven't seen the need as the pedal isn't spongy.



#22 unburntfuelinthemorning

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Posted 18 December 2020 - 10:10 PM

Did you change the flexi hoses? Have found that they can partially collapse over the years and reduce the pressure going to the callipers.

Have had that problem on a mini that had upgrade from drums to discs.

Yes the hoses have been replaced recently front and rear.  The front hoses for discs are different to the ones for drums and were supplied with the kit.



#23 unburntfuelinthemorning

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Posted 18 December 2020 - 10:14 PM

I'd try a decent set of pads first, never heard of ultimax pads, but 'low dust' would stop me buying them, they've got to produce dust if they're going to work properly. I wouldn't touch anything made by EBC either.
I'd go for minutes m1144's or some old school m171's if you can find any NOS. Can't beat having some proper asbestos in them!

I do have my suspicions about the pad supplied.  I've heard mixed things about EBC - these being the "Black" variety.  You're right about asbestos being a great friction material - good insulator too.  It was fine as long as you didn't go around inhaling it which I've never made a habit of.



#24 unburntfuelinthemorning

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Posted 18 December 2020 - 10:19 PM

I use these....

http://www.minispare...MS.aspx|Back to

With no issues but it sounds like you need Mintex 1144 if you are going to be heavy on the brakes a lot.

I`ve been ripped off by EBC in the past on cars and bikes, don`t believe the hype.

So are they standard replacement OEM type Mintex pads?

 

I don't think I was particularly heavy on the brakes.  Surely they should cope with one heavy stop.  If I was doing a heavy stop like that every thirty seconds I could understand the brakes fading after a few goes but after one stop?



#25 unburntfuelinthemorning

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Posted 18 December 2020 - 10:20 PM

I have to say i caned the backside out of my converted brakes with the pads supplied by Minispares and had no issues with brake fade. and this me batting along the bypass at Hailsham which has several roundabouts. 70 mph batting along.

 

Now the only thing i did that has been mentioned was fit some stainless braid hoses and the Cooper S master cylinder. Other than that its the full conversion kit from drums to 7.5' discs.

Did they come with the EBC Black/Ultimax pads?



#26 unburntfuelinthemorning

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Posted 18 December 2020 - 10:24 PM

I've had fade in Discs, but not from a single stop / slow down like that.

 

In addition to what the other guys have suggested here, what wheels are you running and what's the Air Flow through them like ?

 

Also, have you fitted the 'Stone Guards' to them ?

I have 4.5" x 10" 'S' wheels and no disc shields/stone guards as I didn't want them.



#27 unburntfuelinthemorning

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Posted 18 December 2020 - 10:26 PM

Maybe they are binding resulting in a hot disc even before braking.

If you have a temperature gun, go for a normal steady drive then see what the temps are like.

I don't have a temperature gun but there's no excessive heat emanating from the wheels after normal driving and the vehicle rolls nicely when pushed for instance.



#28 sonikk4

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Posted 18 December 2020 - 10:36 PM

I have to say i caned the backside out of my converted brakes with the pads supplied by Minispares and had no issues with brake fade. and this me batting along the bypass at Hailsham which has several roundabouts. 70 mph batting along.
 
Now the only thing i did that has been mentioned was fit some stainless braid hoses and the Cooper S master cylinder. Other than that its the full conversion kit from drums to 7.5' discs.


Did they come with the EBC Black/Ultimax pads?

Good question and to be honest without digging out the receipt I don’t now.

#29 unburntfuelinthemorning

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Posted 18 December 2020 - 10:37 PM

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 

 

 

 

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 

 

Not living in the dark ages, just not having any issues with them. Also it depends on what you doing with the car.

 

When i fit my new engine i will upgrade the pads but my original 998 the pads were more than good enough.

 

Each to their own.

 

I can only think that it's the EBC Ultimax pads causing the problem.  Looks like I need to try an alternative.

 

So these are the EBC pads I have which came with the disc brake conversion kit, these are the Mintex 1144 pads which are highly recommended by quite a few people and then there's also these Mintex pads which absx2 uses and are possibly OEM pads.  There's also these Rover Xparts pads to consider.  So much choice!



#30 unburntfuelinthemorning

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Posted 18 December 2020 - 10:38 PM

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 

 

 

 

Mintex m1144 all day. You'll get people on here tell you 7.5 are fine with standard pads , and they are amazing - living in the dark ages. 

 

Not living in the dark ages, just not having any issues with them. Also it depends on what you doing with the car.

 

When i fit my new engine i will upgrade the pads but my original 998 the pads were more than good enough.

 

Each to their own.

 

I can only think that it's the EBC Ultimax pads causing the problem.  Looks like I need to try an alternative.

 

So these are the EBC pads I have which came with the disc brake conversion kit, these are the Mintex 1144 pads which are highly recommended by quite a few people and then there's also these Mintex pads which absx2 uses and are possibly OEM pads.  There's also these Rover Xparts pads to consider.  So much choice!






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