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Rear Brake Spongy

Dejon Nell

Dejon Nell

Member
Joined
Sep 10, 2020
Messages
24
Location
Cape Town / South Africa
Hello
My 2011 S10 rear brake suddenly went all soft and spongy. Thinking it was low on DOT4 fluid i checked the reservoir and it was full. Bled the rear brake to clear lines of any air bubbles (which there was), replaced and flushed out the lines with fresh brake fluid. The brakes worked well for 2 days and again went soft.... Seems to have sucked air in again as there is zero brake fluid leaks anywhere. My thoughts are leading me to think its gonna need a rear master cylinder repair kit. Anyone else experience this?
 
swakop_toe

swakop_toe

Active Member
Joined
May 28, 2012
Messages
105
Location
Cape Town, South Africa
Yup, recently actually.
I had new rear and front discs cut by Gielie here in Kraaifontein.
Fitted the discs, bled the rear, some bubbles, but could not get it nice and hard again.
Must confess, I rarely use my rear, only front/unified braking, but after the disc swap, had to lean on the front brakes for proper stopping.

Bike went in for a service a week later anyway and had the master cylinder overhauled and all good again.

Sent from my Nokia 5.4 using Tapatalk
 
Jlq1969

Jlq1969

Well-Known Member
Joined
May 5, 2018
Messages
1,800
Location
Argentina
As Patrick says, there aren't many options. Start by making a direct connection between the rear pump and the rear caliper (bypassing the abs), until you decide what to do with that abs pump that is sucking air with the combinated brake operating. You could "try" to disconnect the brake pressure sensor, to prevent the combined brake from activating the abs pump... I don't know if it would work, but apparently when the combined brake activates the abs pump, it sucks in air and injects it in the rear circuit, but the same would not happen when the abs acts only as abs……then the only way to disconnect the combined brake would be to disconnect the brake pressure sensor……and see if air continues to enter. or if you don't want to disconnect the sensor, simply apply the rear brake before the front one for several miles/days, to see if the fault appears
 
Dejon Nell

Dejon Nell

Member
Joined
Sep 10, 2020
Messages
24
Location
Cape Town / South Africa
swakop_toe said:
Yup, recently actually.
I had new rear and front discs cut by Gielie here in Kraaifontein.
Fitted the discs, bled the rear, some bubbles, but could not get it nice and hard again.
Must confess, I rarely use my rear, only front/unified braking, but after the disc swap, had to lean on the front brakes for proper stopping.

Bike went in for a service a week later anyway and had the master cylinder overhauled and all good again.

Sent from my Nokia 5.4 using Tapatalk
Click to expand...
Do you perhaps have a contact number of Gielie please ?
 
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