Guest Posted July 5, 2017 Posted July 5, 2017 Hello allRecently I broke my sight lens of my front brake master cylinder so have ordered a replacement which I will fit tomorrow. I've emptied all the fluid out and the brake lines have stayed in place as they wereIs there anything else I need to do apart from fitting the lens and adding new fluid? Also, I think the person who had the bike before didn't do a great job at fitting things and the way he's fitted the brake line seems very tight at one point around front forks so I've been wanting to undo the banjo to the master cylinder and turn it upside down to give more clearance...if I do this do I need to bleed the lines?It's a Suzuki GS 125, thanks Quote
JRH Posted July 5, 2017 Posted July 5, 2017 I would bleed the brakes as a matter of course.I may even flush the lines until new fluid fills the lines as the old fluid may have got contaminated with water if the bike has been outside and the fluid open to the air for long. Quote
Guest Posted July 6, 2017 Posted July 6, 2017 As you have fitted a new master cylinder, which has air in it, you will need to bleed. If you'd had a separate master cylinder and reservoir, you may have got away with just tapping out any air bubbles between them so long as you hadn't pumped the brake while it was being changed, but it's all one piece on your bike according to the other thread. Quote
Guest Posted July 6, 2017 Posted July 6, 2017 I would bleed the brakes as a matter of course.I may even flush the lines until new fluid fills the lines as the old fluid may have got contaminated with water if the bike has been outside and the fluid open to the air for long. If he has air bubbles at the top from the new master cylinder, and uses new fluid which he should be doing, and bleeds from top to bottom, he will have flushed the lines by the time he gets the air bubbles out the bottom anyway. Quote
rob m Posted July 6, 2017 Posted July 6, 2017 The most effective method I've used over the years for bleeding is the syringe method, especially after replacing parts of the brake system. A 50ml syringe attached to 5mm clear tubing works a treat. Fill the reservoir with fluid, attach the tubing to the bleed nipple on the caliper and after loosening the bleed nipple, 'pull' the fluid through using the syringe. Keep topping up as needed. Always tighten the bleed nipple while pulling the syringe. It's quick and easy and is much more effective than the pumping the lever. I've done it loads of times. Brakes have always felt rock solid afterwards. Quote
Mr Fro Posted July 6, 2017 Posted July 6, 2017 The most effective method I've used over the years for bleeding is the syringe method, especially after replacing parts of the brake system. A 50ml syringe attached to 5mm clear tubing works a treat. Fill the reservoir with fluid, attach the tubing to the bleed nipple on the caliper and after loosening the bleed nipple, 'pull' the fluid through using the syringe. Keep topping up as needed. Always tighten the bleed nipple while pulling the syringe. It's quick and easy and is much more effective than the pumping the lever. I've done it loads of times. Brakes have always felt rock solid afterwards.It's a great way to bleed the system but you can't tug the syringe too hard of air can bypass the master cylinder seal which knackers the whole lot.Gently bentley does the trick. Quote
Guest Posted July 7, 2017 Posted July 7, 2017 Keep meaning to get one of those. There's one here whenever you want to borrow it. The route from Daventry up to Cold Ashby up to J1 of the A14 is a great biking road. Quote
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