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FJR Motorcycle Forums
Technical & Mechanical Problems
ABS unit blocked on front brake circuit.............
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<blockquote data-quote="Donal" data-source="post: 1209160" data-attributes="member: 20675"><p>During my extended winter maintenance I decided to service the brake callipers (front & rear) including replacing all the seals. No big deal, all went well.</p><p></p><p>Then the fun started - while bleeding the front brakes I was getting lots of air bubbles in the returns. I had pumped about 500 ml (new fluid from a sealed container) when it began to pressure up and fluid stopped coming out of the bleed nipple. Went through the lines and confirmed the ‘blockage’ was in the ABS unit!</p><p></p><p>Rearranged the lines to pump through the ABS block in reverse, no blockage. Checked the block diagram and confirmed that the ‘inlet’ control valve had a check valve in parallel, hence the returns in the reverse direction. This confirmed that the 'blockage' was at the inlet valve.</p><p></p><p>Checked through the online parts retailers in the UK and the best price I could find was £1020 plus P&P, however the bad news there were no ABS units in the UK and delivery would be between 4-6 weeks!</p><p></p><p>Checked in the USA and came up with $694 inc P&P, with import duty, VAT etc this would come out at £627.</p><p></p><p>Then checked online breakers in the UK and negotiated one for £259 inc P&P. Made the deal and it arrived next day. It was off a 2009 bike but looked immaculate almost as if the bike had never been outside.</p><p></p><p>Installed the new unit, bled everything, ran the onboard diagnostics and bingo, back in business. Another bullet dodged!</p><p></p><p>I still have no idea what happened to cause the blockage. I will hang on to the old ABS unit for now and try to re-assess manyana……..</p><p></p><p>I have changed the fluid annually just to be on the safe side but................</p></blockquote><p></p>
[QUOTE="Donal, post: 1209160, member: 20675"] During my extended winter maintenance I decided to service the brake callipers (front & rear) including replacing all the seals. No big deal, all went well. Then the fun started - while bleeding the front brakes I was getting lots of air bubbles in the returns. I had pumped about 500 ml (new fluid from a sealed container) when it began to pressure up and fluid stopped coming out of the bleed nipple. Went through the lines and confirmed the ‘blockage’ was in the ABS unit! Rearranged the lines to pump through the ABS block in reverse, no blockage. Checked the block diagram and confirmed that the ‘inlet’ control valve had a check valve in parallel, hence the returns in the reverse direction. This confirmed that the 'blockage' was at the inlet valve. Checked through the online parts retailers in the UK and the best price I could find was £1020 plus P&P, however the bad news there were no ABS units in the UK and delivery would be between 4-6 weeks! Checked in the USA and came up with $694 inc P&P, with import duty, VAT etc this would come out at £627. Then checked online breakers in the UK and negotiated one for £259 inc P&P. Made the deal and it arrived next day. It was off a 2009 bike but looked immaculate almost as if the bike had never been outside. Installed the new unit, bled everything, ran the onboard diagnostics and bingo, back in business. Another bullet dodged! I still have no idea what happened to cause the blockage. I will hang on to the old ABS unit for now and try to re-assess manyana…….. I have changed the fluid annually just to be on the safe side but................ [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
ABS unit blocked on front brake circuit.............
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