front brake reservoir problems please help


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newgoldwingrider
Posts: 41
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Motorcycle: 82 gold wing interstate gl1100

front brake reservoir problems please help

Post by newgoldwingrider » Wed May 02, 2018 10:50 am



Hello ok so I was replacing the brakes on my 82 Goldwing interstate gl1100 and ran into a few minor problems anyway I went to add fluid and one screw broke off down towards were the threads go in and the other screw broke off at the head so now I have the cap off the cup but two broken screws is there any way I can take that apart to try to get the screws out or drill and tap them or will I have to replace whole master cylinder. please help.



DaveO430
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Re: front brake reservoir problems please help

Post by DaveO430 » Wed May 02, 2018 12:44 pm

Not much chance of getting those screws out but you can get a new reservoir. 45511-MA5-671 CUP, OIL
And don't forget the o-ring. 45516-166-006 O-RING (26.7X2.4) You won't find one that fits anywhere else but Honda.

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mytown
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Re: front brake reservoir problems please help

Post by mytown » Wed May 02, 2018 6:32 pm

I had a very similar problem, see here:viewtopic.php?f=4&t=38518
You need to remove the reservoir so as not to damage it or the body of the MC. I think I used a couple of thin scrapers and carefully but firmly pried upwards. There is a large o-ring holding the cup in place. Personally I found the diameter of the screw to be so small that drilling a hole down its center in order to allow the use of an easy out impossible. What you see in the link above is the efforts that followed trying to do so. I'm happy with my results but buying and rebuilding a used MC should work too. Just be sure that the screws in that one are not stuck!

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Thu May 03, 2018 8:27 am

Thank you for your replies i tried everything and nothing worked to save it i ordered a new MC online and it should be here monday so going to replace whole thing i will let you know how it turns out.

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Tue May 08, 2018 11:31 am

ok so i got a new master cylinder and put it on and put new brakes on and took it for a ride but i didnt clean the pistins real well and now they are seizing up after a few minutes could that be the issue that the pistons are not releasing. the old brakes were really worn the one side really didnt have ant pad left and bike is old and has not really bin serviced much so with that and new pads on the pistons are in farther then they have been in a long time could the corrosion on the pistons be causing them to seize.

DaveO430
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Re: front brake reservoir problems please help

Post by DaveO430 » Tue May 08, 2018 1:43 pm

Take a wrench with you for the bleeders and go fro a ride, when they start to seize stop and open the bleeder. If it releases pressure it's probably the new master cylinder's fault.

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mytown
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Re: front brake reservoir problems please help

Post by mytown » Tue May 08, 2018 4:17 pm

The theory is that if you apply the brakes and they stick, and then you release the pressure in the calipers (check both) by opening the bleeder valve and they remain stuck, then the pistons in the calipers are not releasing/returning. On the other hand, if they release when you open the bleeders, that suggests that the problem is that the fluid is being blocked from returning into the master cylinder reservoir and like Dave430 says, the problem is likely the MC. I've also read where old brake hoses can become swollen to the point where brake fluid is prevented from returning to the MC, had that happen with a car once. BTW, you might not have to go for a ride but rather just have the front wheel off the ground.

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Thu May 10, 2018 11:46 am

haven't had a minute to try yet but wanted to ask if it is the mc what do i do i just bought it it is brand new. i don"t think its the hoses because i have never had a problem with the old brakes or mc they always worked fine

DaveO430
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2004 Suzuki DR200

Re: front brake reservoir problems please help

Post by DaveO430 » Thu May 10, 2018 7:14 pm

Take the lever off and see if it's letting the plunger come all the way back. You might need to grind a little off where the lever meets the plunger, be careful and don't grind any more off than needed.

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jeffcosmo
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Re: front brake reservoir problems please help

Post by jeffcosmo » Fri May 11, 2018 12:00 am

Do the caliper pistons have corrosion??
If so, that is your first item to correct. Rebuild those calipers!!
If the problem persists (I doubt it will), then, and only then, address the master.
It is highly unlikely that the new master will be the cause, esp. considering the age and condition as you describe.

Cosmo

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Fri May 11, 2018 7:51 am

yes the pistons are corroded and i had planed on cleaning but thought i would take the lazy way out and try to get away without doing it but i believe that is the issue and actually really hope it is. also what are the chanced that i can reuse the o rings for the pistons.

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jeffcosmo
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Re: front brake reservoir problems please help

Post by jeffcosmo » Fri May 11, 2018 11:52 am

newgoldwingrider wrote:
Fri May 11, 2018 7:51 am
also what are the chanced that i can reuse the o rings for the pistons.
If they are not cut, you may get away with it. I've done rebuilds for years without replacing 'o' rings. But the pistons MUST be polished before re-installing. A little pitting does not appear to hurt sealing, but do check thoroughly for leaks.

Cosmo

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Mon May 14, 2018 11:31 am

ok so i tried bleeding the brakes and still locked up so it is probably the pistons not the MC will update as i go along

newgoldwingrider
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Re: front brake reservoir problems please help

Post by newgoldwingrider » Fri May 25, 2018 5:55 am

Ok so I'm having trouble getting the Pistons out I tried pumping the brakes and can't get them to come all them he way out I know someone said about grease gun or air how do I do that do I need to screw something on to them the caliper to do either



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