1
Frozen front caliper pistons Thu Dec 02, 2021 9:10 am
Robpud
New member
Any tips on freeing up seized front brake pistons? Thanks Rob.
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1
New member
2 Re: Frozen front caliper pistons Thu Dec 02, 2021 10:39 am
moriarti
Life time member
Dependant on your Tools and Talent. Start with pad removed apply pressure and gentile use of a hammer on the casing of piston in question .
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1984 k100 rs red/black VIN 0004449 Now sold to Olaf
3 Re: Frozen front caliper pistons Thu Dec 02, 2021 3:34 pm
Robpud
New member
Thanks, l will give that a try.
4 Re: Frozen front caliper pistons Thu Dec 02, 2021 8:46 pm
92KK 84WW Olaf
Life time member
Put the pads in backwards with the caliper off, friction material facing the pistons and use a blade screwdriver between the backing plates to lever the pistons back. Screwdriver against the pistons can break them....
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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles.
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles
Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
5 Re: Frozen front caliper pistons Thu Dec 02, 2021 11:10 pm
Laitch
Life time member
Are the pistons retracted or extended? Is the caliper still mounted?
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1995 K75 90,000 miles
6 Re: Frozen front caliper pistons Fri Dec 03, 2021 12:11 am
Point-Seven-five
Life time member
I got a pack of the shims that carpenters use to install windows and doors. With the caliper off and the pads installed I put two shims in the gap pointing in opposite directions. By tapping the end of one of the shims a force is applied evenly across the face of the brake pads to push them apart and the pistons into the caliper.
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Present: 1991 K100RS "Moby Brick Too"
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
7 Re: Frozen front caliper pistons Fri Dec 03, 2021 6:10 pm
Robpud
New member
The brakes including the master cylinder have been removed fully connected in one piece. The pistons are positioned at the normal brake disc thickness.
So loosen the pistons first by moving the pistons back in further, ok thanks again guys
So loosen the pistons first by moving the pistons back in further, ok thanks again guys
8 Re: Frozen front caliper pistons Fri Dec 03, 2021 6:18 pm
stanthomas
Silver member
My experience has been that simply moving the pistons in and out doesn't help long-term. Certainly useful to push the pistons back to get the calipers off the bike but, after that, whatever was causing them to bind in the first place will come back.
If, after manipulation, the pistons can't be pushed back by hand (thumb) pressure then it's calipers apart. If you're lucky you'll get away with a set of seals. In salt plagued Britain, the pistons are likely corroded and on truly neglected ones, like mine, the caliper might be corroded beyond repair too.
A woodworking G-clamp can be used to press the pistons in.
If, after manipulation, the pistons can't be pushed back by hand (thumb) pressure then it's calipers apart. If you're lucky you'll get away with a set of seals. In salt plagued Britain, the pistons are likely corroded and on truly neglected ones, like mine, the caliper might be corroded beyond repair too.
A woodworking G-clamp can be used to press the pistons in.
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K100RS 16V '91
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