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HiSpec (Westfield) 4 pot brake problem


Sand Dancer

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Sand Dancer

Following my build I have noticed a noise coming from the rear of the car, I initially put it down to the sound of the fuel pump.

 

However I have just had my car set up by Luke at Playskool and he identified the noise as coming from the rear brakes – as if they are binding.

(I fitted  a set of Westfield HiSpec 4 pot brake callipers to the front and rear of my FW Special Edition car.)

 

I took the car home and examined the discs of the brakes.

 

IMG_4001_zps47kldls8.jpg

 

As can be seen from the picture there is marking around the outer portion of the disc – as if the pads are binding. It is the same on both the nearside and offside wheels. It is larger than the hand brake pad – and could well be the size of the main pads.

 

Has anyone come across this problem before – is there a method of adjusting the pads?

I have not as yet taken the pads out – as I do not have a tool to wind the pistons back in.

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They look like 2 pot calipers to me. The 4 pots have an issue where the piston bores are too high in the caliper body so they only push the top part of the pad, but the ones in the photo look ok.

I don't think you will need a wind back tool, will they not be a plain piston with separate handbrake mechanism?

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Thrustyjust

You will need a standard caliper piston spreader tool or a big lever , but that could damage the pads. No wind back too required. Best thing to do, is to put some washers on the studs and then nut the discs tight and see if the caliper is central to the disc and see if thats the reason the pads and binding, rather than clamping on.

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Difficult to see at that angle but are the pads overlapping the edge of the disc ? (may just be the angle of the photo but the caliper looks as though it's too big for presumably the standard Escort MK3 rear disc) - if the pads are overlapping, then they will almost certainly wear with a step and try to distort themselves in the process which may be why they look like they're binding on?

 

As mentioned though, I'd also check that the disc itself is central to the caliper and "true" in terms of pistons being parallel to disc surface (this all assumes that the upright is designed for these calipers as well  ??? )

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Terryathome

The pic is a rear caliper as I can see the handbrake adjuster on the top. Check handbrake adjuster on calipers are adjusted correctly so they are not binding and check the locking nut is tight. Locking nut doesn't quite look right from you pic maybe take a few more so we can see.

Also what pads have you got in there? some of them need a bit of tickling with a grinder so they don't rub.

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jonjh1964

As I'm sure you're aware this calliper has two pads - the main road braking MGB533 and a small button pad for the hand brake.  It might be worth taking off the calliper and seeing if one or the other is the cause of the binding, looking at the photo it could be the hand brake button pad as it touches on the outer edge of the disc.  I have the opposite limited wear on the outer edge of the disc and the rears, especially the o/s not appearing to do much work.  I'm intending to fit an adjuster for  front/rear brake bias over the winter to see if this improves things.  Also check the bottom edge of the pad for contact with the disc bell, these callipers can be fitted with an MGB535 pad that has a circular cut out to clear the disc and mine needed a mm or so filed off it when I fitted new discs/pads, the photo does appear to have a wear line on the bell but it's not that clear.  I believe that Hi-Spec now supply MGB533 pads that don't need modifying and have a better fiction material centring on the main calliper pistons.

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CosKev

As above,pics needed of how the disc is sitting between the pads ideally for a better idea.

While the wheels are off bang a coat of paint on that bell part of the disc before it goes majorly rusty!!! :d

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That marking on the outer part of the disc does look like the handbrake spot pads are set too tight. Adjusting the handbrake correctly with these calipers is quite tricky. You need to adjust both caliper mechanisms and the cable adjuster under the transmission tunnel to get it all just right.

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Terryathome

The handbrake at the calipers can be adjusted correctly but the handbrake cable sometimes sticks and holds the pads on the discs resulting in the rings you see on the discs

This results in pad wear and multiple adjustments.

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