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Old 1 Week Ago   #1
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100HP Rear brakes.

Hi, I've just fitted new discs and pads to the rear of the Panda 100HP. Drivers side rear all worked fine but.....passenger side (Near side Left side ?) once reassembled I had no brakes? After a bit of pedal pushing I've now got a foot brake but still no hand brake. Do anyone have any helpful suggestions?
I used a windback tool on both sides turning clockwise although some say anti clockwise for passenger side?

Cheers,
Andy
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Old 1 Week Ago   #2
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Re: 100HP Rear brakes.

Check the pads have fully extended and the hand brake cables might need adjusting. You have to remove the centre "console" to get at them.

The best way to test rear hand brakes is to reverse the car with the brakes on. The wheel that does not skid needs the cable to be tighter. You can try it with the foot brakes but the more powerful fronts may prevent progress.
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Old 1 Week Ago   #3
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Re: 100HP Rear brakes.

Did you make sure that the notch on the caliper was in the right position?

gr J
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Old 1 Week Ago   #4
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Re: 100HP Rear brakes.

No I didn't line any notches up. Please explain.
Thanks.
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Old 1 Week Ago   #5
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Re: 100HP Rear brakes.

The callipers have 4 dents in them. One of them has to line up with the pin on the pad.

gr J
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Old 1 Week Ago   #6
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Re: 100HP Rear brakes.

As above, check the position of the notch on the caliper piston is correct. You need to actuate the handbrake multiple times after winding the pistons back to reset their positions with the new disks/pads.
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Old 1 Week Ago   #7
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Re: 100HP Rear brakes.

Thanks All. One pad had a dimple for the piston to locate on the other pad didn't. I obviously got it wrong way round. So now swapped round and positioned to line up with one of the four cut aways in the piston I have a hand brake that works but the foot brake is poor. After a short drive 3 disks are hot but NSR is cold? If I jack the car up and apply the hand brake I can't rotate the wheel, but if my wife pushes the foot brake I can with some effort still rotate the wheel. The wheel spins freely when all brakes are off. Looking at the piston it pushes out maybe 5mm when the foot brake is operated but retracts by the same amount when it is released? Has anyone seen this before.
Thanks,
Andy
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Old 6 Days Ago   #8
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Re: 100HP Rear brakes.

Disc brake pads touch the disc with brakes off so only have to move a tiny amount to apply the brakes. If the sliding pins or the piston are sticking the brake will not work. Worst case you need a new or reconditioned caliper.
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Old 6 Days Ago   #9
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Re: 100HP Rear brakes.

Thanks. Handbrake works well, the slides are free and the piston moves out when you apply the foot brake but when you release the foot brake it moves back again. I may try bleeding the brake, not for any logical reason but it is something I have not tried.
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Old 6 Days Ago   #10
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Re: 100HP Rear brakes.

If it ends up being the caliper has anyone bought one recently and have a recommend supplier?
Quote Originally Posted by DaveMcT View Post
Disc brake pads touch the disc with brakes off so only have to move a tiny amount to apply the brakes. If the sliding pins or the piston are sticking the brake will not work. Worst case you need a new or reconditioned caliper.
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Old 6 Days Ago   #11
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Re: 100HP Rear brakes.

Fresh brakefluid and properly bled?

gr J
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Old 6 Days Ago   #12
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Re: 100HP Rear brakes.

Yes, I've no idea how old the brake fluid is and to be honest it does look a bit cloudy.
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Old 6 Days Ago   #13
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Re: 100HP Rear brakes.

New brake fluid will not fix a jammed brake piston.

Contact these people they may have what you need
https://www.ebay.co.uk/itm/FIAT-GRAN...QAAOSwVzRbaXUC

Also call Shop 4 parts (phone not website)

https://www.bcs-automotive.co.uk/bra...refurbishment/
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Old 5 Days Ago   #14
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Re: 100HP Rear brakes.

Thanks Dave, you are of course correct. I don't think the piston is jammed though because with the caliper removed I've seen the piston extend by about 5mm when the pedal is pushed, however it retracts by 5mm when the pedal is released. Unless it's tight in the seal and stretching it then it's pulling it back l may get an unwilling volunteer to pump the pedal whilst I try a bit lube on the piston whilst it goes out and in.
Thanks again for aĺl suggestions.
Quote Originally Posted by DaveMcT View Post
New brake fluid will not fix a jammed brake piston.

Contact these people they may have what you need
https://www.ebay.co.uk/itm/FIAT-GRAN...QAAOSwVzRbaXUC

Also call Shop 4 parts (phone not website)

https://www.bcs-automotive.co.uk/bra...refurbishment/
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Last edited by AndyS65; 5 Days Ago at 09:10.
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Old 5 Days Ago   #15
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Re: 100HP Rear brakes.

Fresh fluid is always the first thing I do to a new (to me) car. Currently on ATE racing. Old fluid has attracted lots of water, lowering boiling point, causing rust and sometimes internal desintegrating brakehoses.

gr J
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