SOHC.co.uk Forums > CB750
CB750F1 Rear Disc Brake
Doswen:
--- Quote from: Laverda Dave on October 09, 2020, 03:02:27 PM ---To add to John's comment, make sure the outside metal edge of the pad is clean with no rust as this can sometimes just cause enough friction between the pad and the inside face of the caliper body to prevent the pad from fully retracting.
--- End quote ---
Morey, the pads are new and there is no rust. The bike has just undergone a 2 1/2 year refurb.
Doswen:
--- Quote from: Moorey on October 09, 2020, 04:08:48 PM ---
Is it a F1 seal kit as they can be very hard to find now.
--- End quote ---
Dave, it is an F1 and yes the kit was difficult to find in the UK. I had to order the GL1000 kit From the USA and cut down the plunger thread. The kit is otherwise identical but I have also tried another set of seals from another F1 master cylinder and it’s no different. Still locks up under load.
K2-K6:
It is "classically" a restriction of the return route into the mastercylinder.
If all the caliper works ok and is demonstrably free, then it's just the fluid that's holding the pads from retracting. From then on it'll heat fairly quickly.
Are you certain that you've seen completely clear passages within the mastercylinder? I'd be surprised if it's not within there.
Moorey:
--- Quote from: Doswen on October 09, 2020, 05:18:29 PM ---
--- Quote from: Moorey on October 09, 2020, 04:08:48 PM ---
Is it a F1 seal kit as they can be very hard to find now.
--- End quote ---
Dave, it is an F1 and yes the kit was difficult to find in the UK. I had to order the GL1000 kit From the USA and cut down the plunger thread. The kit is otherwise identical but I have also tried another set of seals from another F1 master cylinder and it’s no different. Still locks up under load.
--- End quote ---
No idea how much you cut off the plunger thread but i had to cut 6mm off the GL plunger and it worked fine.
Doswen:
--- Quote from: K2-K6 on October 09, 2020, 05:26:08 PM ---It is "classically" a restriction of the return route into the mastercylinder.
If all the caliper works ok and is demonstrably free, then it's just the fluid that's holding the pads from retracting. From then on it'll heat fairly quickly.
Are you certain that you've seen completely clear passages within the mastercylinder? I'd be surprised if it's not within there.
--- End quote ---
I‘ve had a cocktail stick through the return hole and blown it with an airline. I’ve checked it 4 times now !
I just can’t work it out.
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