Seized Front Calipers


Information and questions on GL1000 Goldwings (1975-1979)
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GL1000K1dan
Posts: 10
Joined: Thu Aug 09, 2018 3:26 am
Location: England
Motorcycle: 1976 GL1000 K1

Seized Front Calipers

Post by GL1000K1dan » Sat Nov 30, 2019 4:49 am



Had an expensive refurbishment carried out on the front calipers. I reinstalled the pads and fitted the calipers back onto the forks. Brake lines were reconnected and the system bled (took ages).
I then wheeled the bike off the ramp and applied the front brake and the front locked up !
The pads are solid against the discs. I have cracked both bleed nipples and the brake lever is free to move but the pads remain solid against the discs.
Short of getting a lump of 4x2 wood and whacking the calipers off the disc, can anyone suggest a less aggressive method of removing the calipers to inspect them.



GL1000K1dan
Posts: 10
Joined: Thu Aug 09, 2018 3:26 am
Location: England
Motorcycle: 1976 GL1000 K1

Re: Seized Front Calipers

Post by GL1000K1dan » Sat Nov 30, 2019 6:05 am

Just cracked off the brake lines to the calipers and the pads have now released.
Obviously, there is something not quite right going on inside the caliper(s).

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DenverWinger
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Re: Seized Front Calipers

Post by DenverWinger » Sat Nov 30, 2019 7:00 am

If the calipers released after cracking loose the brake lines, that sounds to me like there was still pressure in the system until you loosened the lines (probably lost a little brake fluid). In which case the calipers likely OK and Master Cylinder is suspect. Did you rebuild that too? Be sure little tiny fluid return hole is clear.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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SnoBrdr
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Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

131K Original Owner

Re: Seized Front Calipers

Post by SnoBrdr » Sat Nov 30, 2019 8:12 am

DenverWinger wrote:
Sat Nov 30, 2019 7:00 am
If the calipers released after cracking loose the brake lines, that sounds to me like there was still pressure in the system until you loosened the lines (probably lost a little brake fluid). In which case the calipers likely OK and Master Cylinder is suspect. Did you rebuild that too? Be sure little tiny fluid return hole is clear.
What shape are the brake lines in?

Are they original?

They often collapse after 40+ years.

GL1000K1dan
Posts: 10
Joined: Thu Aug 09, 2018 3:26 am
Location: England
Motorcycle: 1976 GL1000 K1

Re: Seized Front Calipers

Post by GL1000K1dan » Sat Nov 30, 2019 11:26 am

Thanks for replies, however, I have found the problem.
The new banjo bolts that were supplied with my refurbed calipers are 10mm longer than the ones I removed before the refurb (not sure if these are the original banjos fitted when the bike was new, 43 years ago). I guess the huge pressure from the brake lever caused the fluid to just squeeze past the banjo bolts and onto the pistons but, with insufficient clearance, the pressure on the pistons could not be released back into the lines thereby locking the pads against the discs.
Anyways, fitted the shorter banjos, bled brakes and they work a treat.
Another small step in the recomissioning process and a happy camper, again.
Next job is to get the bike outside and balance the carbs, but now it’s dark so a job for tomorrow.



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