Bleeding the rear brakes

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tonyn
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Bleeding the rear brakes

Postby tonyn » Tue Jul 25, 2017 10:34 pm

I've heard of others having the same issue with having to bleed the the rear brakes every now and then due to a soft pedal and yet can't find any leaks on my Gen 2
Does anyone know if it's the the foot pedal master cylinder or the rear calipers the issue

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Re: Bleeding the rear brakes

Postby Roguedog » Wed Jul 26, 2017 6:29 am

Try messaging Totgas, he recently had this issue and had work done on his rear MC.
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Totgas
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Re: Bleeding the rear brakes

Postby Totgas » Wed Jul 26, 2017 10:47 am

tonyn wrote:I've heard of others having the same issue with having to bleed the the rear brakes every now and then due to a soft pedal and yet can't find any leaks on my Gen 2
Does anyone know if it's the the foot pedal master cylinder or the rear calipers the issue


Yes, exactly the same issue. 1 minute the back brake was fine the next spongy as hell.
Took it to the dealer who said he couldn't find any issue except small bit of air in front brake line (had a service at the same time). Went for a ride after the service and rear brake still crap. Front is much stronger, but that wasn't the issue. Took it back, he was scratching his head so I asked him to put a master cylinder kit in - Tells me that there isn't one in Australia. 2/52 to get 1 in from Japan. So ended up asking him to fit an after market kit. Did, and it still hasn't made and difference. Only thing I can think of it that the genuine one comes with a new piston, after market didn't - Could it be the piston has somehow worn? Don't know, but currently riding around with spongy rear brake - Not happy Jan!

tonyn
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Re: Bleeding the rear brakes

Postby tonyn » Wed Jul 26, 2017 10:09 pm

Thanks Totgas, are you talking about the main master at the handle bar or the foot brake master cylinder
I've had the bike 3 or 4 years now only just started to do this in the last year and I am a mechanic by trade but can't find any leaks and yes it's frustrating as a soft pedal is annoying
I might check some overseas websites

tonyn
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Re: Bleeding the rear brakes

Postby tonyn » Wed Jul 26, 2017 10:11 pm

Thanks Roguedog

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Diversion
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Re: Bleeding the rear brakes

Postby Diversion » Wed Jul 26, 2017 10:32 pm

You need to fully flush the brakes every two years as brake fluid sucks up water. That said the problem is probably thanks to the stupid linked brake system. You will need to flush and bleed the forward line as well as the rear calliper and rear master. Bleed the front calliper then the rear then the front again then the rear again to ensure that no air or water is trapped.
What is possibly going on is if you apply the front brake but not the rear fluid maybe getting pulled out of the rear towards the front causing a spongey pedal when you do use the rears.
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The White Tiger
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Re: Bleeding the rear brakes

Postby The White Tiger » Thu Jul 27, 2017 11:24 am

Just curious here with the linked brakes on my Gen II. When you hit the front brake, it only operates the front brakes. When you hit the rear brake, it only brings on one of the front pistons as well as the rear. That's what the second hydraulic hose is on the right hand side. Aren't the front and rear brake fluids completely separate :?: :think:
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Re: Bleeding the rear brakes

Postby Diversion » Thu Jul 27, 2017 3:11 pm

The White Tiger wrote:Just curious here with the linked brakes on my Gen II. When you hit the front brake, it only operates the front brakes. When you hit the rear brake, it only brings on one of the front pistons as well as the rear. That's what the second hydraulic hose is on the right hand side. Aren't the front and rear brake fluids completely separate :?: :think:

Correct. The master cylinders aren't linked. The rear master operates one front calliper.
If there were a safe way to disconnect them I'd consider it as it's a stupid idea brought about by idiots who don't know how to ride and use the brakes properly killing themselves by not using the front brakes in an emergency.
And has probably caused a lot of accidents when riders who needed rear brakes only lost the front thanks to that.
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Re: Bleeding the rear brakes

Postby john foley » Thu Jul 27, 2017 4:17 pm

HI Yes I had the same problem with the rear brake, until I did a fluid change three times I had to do, front then back front then back. I used a lot of brake fluid. Now I have a full pedal. I think air gets trapped in the abs unit. TT.

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Re: Bleeding the rear brakes

Postby Roguedog » Thu Jul 27, 2017 7:04 pm

Didn't have this problem on my 71 T500, cable operated drum front and rear!!
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