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General Category >> Rubber Side Down! >> rear drum improvement
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Message started by splash07 on 03/22/09 at 13:16:49

Title: rear drum improvement
Post by splash07 on 03/22/09 at 13:16:49

OK, so I understand the whole drilled/slotted rotor thing. It helps vent the gasses created and improves pad contact. So is it possible to slot the inside of the rear drum to accomplish the same thing?

Title: Re: rear drum improvement
Post by justin_o_guy2 on 03/22/09 at 14:12:39

I dont know if grooves on the drum would vent gasses away & improve the grip of the shoes on the drum, but why would we need to? Stock, mine would lock up with just 3 wet turkey feathers laying on the brake pedal. YES~! I tested that,,
What? You dont believe me? I am crushed.. just crushed.

Anyway, it would lock up with such light pressure I couldnt use it "Hurriedly" w/o sliding the tire, so I modded the brake pads & now I can push on the pedal a good bit more w/o a lockup.

Title: Re: rear drum improvement
Post by splash07 on 03/22/09 at 14:48:18

Would the grooved drum increase lock up or decrease? if nothing else would it cause the pad to wear more evenly?

Title: Re: rear drum improvement
Post by Charon on 03/22/09 at 15:50:39

You have not made clear the object of the exercise. Are you trying to decrease the required pedal effort? Are you trying to increase the required effort prior to locking the wheel? Or do you have something else in mind?

In any case, whether disc or drum, the rear brake doesn't contribute a lot to the total stopping ability. Given that the front brake is used, the rear may possibly contribute up to about 1/3 of the total effort, on a very-long-wheelbase bike such as a raked cruiser. On a short-wheelbase bike such as a sportbike, the rear brake is almost useless if the front brake is properly used.

Title: Re: rear drum improvement
Post by verslagen1 on 03/22/09 at 16:15:06

13100C0113085057600 wrote:

Would the grooved drum increase lock up or decrease? if nothing else would it cause the pad to wear more evenly?

On the front, grooves and vent holes are said to increase braking power. But even though the savage is a cruiser, it's a small bike and the rear is less effective then other cruisers.
If your intent is to reduce locking up the rear tire, then look to JOG's advice.

Title: Re: rear drum improvement
Post by justin_o_guy2 on 03/22/09 at 23:17:00

I took the edge of a grinder disk to the shoes & made 4 or 5 grooved across the shoes, decreasing the contact area by somewhere around 1/3 or a bit more. I tapered the leading edge of each area a bit. I like the rear brake a lot better now. It will lock up, but I can feel the pressure on my ankle, whereas before, I couldnt even feel the pedal press against the sole of my boot. I like to keep the pedal high, very little play before the shoes hit the drum.

This way, if a mod isnt good, the hub isnt screwed. just the shoes.

Title: Re: rear drum improvement
Post by splash07 on 03/23/09 at 07:07:07

Thanks for the sound advice JOG. and thanks for everyones input

Title: Re: rear drum improvement
Post by justin_o_guy2 on 03/23/09 at 14:01:39

Be sure to use appropriate safety measures. Grinding on brake shoes could be less than healthy, ya know??? Eyes & Lungs,, IDK if they still have bestasses in them or not, or is that asbestos?Whatever, dust from brakes isnt likely to be a good thing to breathe. Dont cheap out here, okay?

Title: Re: rear drum improvement
Post by splash07 on 03/23/09 at 14:37:41

for sure I wouldnt do this type of mod without a respirator and goggles.