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Thread: Brakes overheating and blocking...

  1. #1
    Spanner Monkey TheDane's Avatar

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    Brakes overheating and blocking...

    Hi guys,

    So I have finally got my MK1 Escort ready for the MOT, after 15 years But I'm experiencing som trouble with my front brakes overheating after something like 10 min's drive.

    Past setup was:
    Unidentified long struts
    Solid discs
    Standard calipers
    Rubber brake lines

    New setup is:
    Bilstein struts
    Vented discs
    Spaced M16 calipers
    Goodridge Braided brake lines

    I have had my brake tower (MK2 unit), servo, master cylinder (19mm ATE) removed, pulled apart, painted the tower, and servo (outside only), master cylinder cleaned and refurbished with new seals.
    Master cylinder seemed to work like new.
    Servo works, as brake pedals drop when turning on engine.

    Calipers have had new pistons and piston seals.

    All lubed up with some ATE brake grease.

    Everything seems to work fine, when bleeding the brakes. When realising the brake pedal, wheels rotate.

    I tried to adjust the pedal pushrod, and thought that would cure the problem. But to no luck. I have even tried to adjust the pushrod all the way in, so it's as short as possible, but that only brings my brake pedal lower to the floor.

    Still after 10min's drive, brakes overheat, and I have to wait for them to cooldown.

    Last night out testing, I noticed a couple of high POPS/KLONKS, after 30mins of cooldown as something loosened? I'm thinking the pads ungripping brake disc, og maybe pistons retracting?


    I really thought this would be a quick fix, just by adjusting the brake pedal pushrod, but doesn't seem like that.

    So what do you guys reckon could be the culprit of this?
    Last edited by TheDane; 26-08-2017 at 10:09.

  2. #2
    Pit Crew Decade Plus User MegatronUK's Avatar

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    Re: Brakes overheating and blocking...

    How easy do the pads fit in the calipers? If they are tight at all they could be binding on as they warm up. They shouldn't rattle around when you fit them, but also shouldn't be too tight either.

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    Re: Brakes overheating and blocking...

    as above..something is expanding when it gets hot and sticking.....

    If the disc was warped.(which would cause overheating...but not sticking).you would feel this when braking...cheers mark

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    Bodger scoobymike's Avatar

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    Brakes overheating and blocking...

    Quote Originally Posted by MegatronUK View Post
    How easy do the pads fit in the calipers? If they are tight at all they could be binding on as they warm up. They shouldn't rattle around when you fit them, but also shouldn't be too tight either.
    I recently had similar problem on mates mk2. Found pads were to tight in calipers. So I gently sanded the metal sides of pads. So they were a slacker fit in calipers. Copper greased them up Done the job tho.

    Sent from my SM-N9005 using Tapatalk

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    Spanner Monkey TheDane's Avatar

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    Re: Brakes overheating and blocking...

    Well, it's 2 years ago I refurbished it all, and from what I remember, the pads were a perfect fit. But I will have a look at them Monday, and try sanding the sides a bit, if they seem like a tight fit.

    Pads weren't anything special, as I remember. Can't remember if I bought the discs and pads from rallydesign, or Burton. Something tells me, they were from RallyDesign. Pads were stock pads, and discs were drilled and grooved.

    I measured the runout of the discs when mounted. And they had a runout of 0.1mm. Which I kinda thought as to much, from what haynes said. But someone here, mentioned that was quite all right. But wouldn't think that could cause it.

    Haven't done any hard braking at all. Only gentle braking.
    Last edited by TheDane; 26-08-2017 at 20:00.

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    Racer Decade Plus User wildo105e's Avatar

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    Re: Brakes overheating and blocking...

    I had this on my mk1 without a servo. You need some free movement in the rod as the fluid cannot get back into the reservoir when it expands. not sure how the servo rod adjusts etc and you say you have tried this but maybe recheck or investigate further.

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    Pit Crew Decade Plus User MegatronUK's Avatar

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    Re: Brakes overheating and blocking...

    Quote Originally Posted by scoobymike View Post
    I recently had similar problem on mates mk2. Found pads were to tight in calipers. So I gently sanded the metal sides of pads. So they were a slacker fit in calipers. Copper greased them up Done the job tho.

    Sent from my SM-N9005 using Tapatalk
    My dad retired last year; he was a self employed mechanic for 30+ years. About 5 or 6 years ago he went through a period where a good 50% of the brake pads that were being supplied from the local motor factors (across a whole range of makes and models) where too tight to fit without having to grind one or more edge back. It got so bad that they actually got the sales rep for the brake pad supplier to actually come out and see first hand (at my dads place, amongst others) that their pads simply didn't fit. I think they eventually swapped to a different brake pad supplier.

    Definitely worth checking.

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