2003 Aprilia RSV Mille R Logo
Posted on Mar 21, 2011
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My front brakes feel spongy when I squeeze it. The brake handle almost touches the hand grip. Does this mean I need new brakes or that I may have a leak somewhere?

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tombones

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  • Master 3,567 Answers
  • Posted on Mar 21, 2011
tombones
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It means there is air in the brake line. If the fluid gets too low in the brake cylinder air gets pumped into the system when the brake is applied. A loose fitting or bad seal is usually why the fluid gets low. Fix the leak then add fluid and bleed the system of air. First bleed the master cylinder at the lever. There should be a bleeder valve on the cylinder. Put a clear rubber hose on the end of the bleeder valve. Run the hose into a container so the brake fluid doesn't get on paint or plastic parts. The fluid can mess up the finish. Now squeeze the brake lever several times in rapid succession then hold the lever in without releasing it. Open the bleeder valve slowly and fluid and air bubbles will come out of the valve. Close the valve BEFORE releasing the lever. Do the same thing multiple times until only fluid comes out of the valve. Do not let the cylinder run out of fluid while bleeding. If it does, you have to start all over again.
Now do the same procedure on the wheel caliper.
Understand that the master cylinder and / or the wheel caliper may need new seals. Please rate my answer. Thanks! My front brakes feel spongy - tombones49_9.gif

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  • Master 8,909 Answers
  • Posted on Mar 21, 2011
Anonymous
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The brakes probably just need bleeding and fresh fluid.

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Hi, spongy brakes is usually from air in the system, only in really old bikes and poor quality brake lines will cause spongy breaks where the brake lines expand instead of full pressure being applied to the brake pads, very rarely will the brake pads cause spongy brakes (unless over heated), once you get rid of the sponginess you will get strong braking. Bleed your front brake system taking care not to let the master cylinder run out of fluid, this is the easiest and cheapest start, once all the air is out then you can work your way through, another good way of testing your braking system, but you need to be very careful doing this and make sure your brake lines are not hard or brittle, you can squeeze the brake line at certain spots (using a pair of brake line pliers), eg. squeeze after the master cylinder. if brakes spongy than your master cylinder needs attention, if brakes hard than your problem is further down the line, calipers etc. Hope this helps.
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I have read and re-read your problem and I keep going back to the "spongy" feel, which strongly suggests air in the lines.
Make sure you have no brake fluid leaking anywhere, especially in the "tee" where your brake line splits to feed both calipers.
Even the smallest leak will allow air to be introduced.
If you are absolutely certain that you have no air in the lines, the most likely problem is one or both caliper pistons are worn and allowing fluid to leak by under pressure.
I recommend replacing the calipers- If you rebuild them, the slightest mistake honing the cylinders will result in your needing to replace anyway.
HD parts can be very expensive, so I suggest you check out Tedds in Newburgh, NY: They have a huge selection and prices are reasonable. You will need to google it because this site keeps dropping me when I try and post the link- world wide web dot vtwinmfg dot com
If you have ever watched American Chopper (love 'em or hate 'em), this is where the Tuthills get allot of their parts. They will send you a HUGE catalog for free.
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