Break Parts

[shawn]

I have a leaking rear caliper.I took it off this morning.The 2 little pin bolt look very rusty I sprayed them came in the house to write this.What kind of job is rebouilding it and wheres the pest place to order parts online?Should I just get one already rebuilt? Thanks for any help! I ment brake parts.I dont want to break parts!

Edited March 6, 2013 by shawn

[bongobobny]

OK I see by your profile you have a MK2. Probably the best thing you can do is replace your old calipers with Yamaha R1 calipers. The cost to rebuild your calipers will end up being waaay more than what a good set of R1's off Fleabay...

[dingy]

OK I see by your profile you have a MK2. Probably the best thing you can do is replace your old calipers with Yamaha R1 calipers. The cost to rebuild your calipers will end up being waaay more than what a good set of R1's off Fleabay...

 

Poster is indicating his rear brake is the problem.

I have tried a wide variety of front calipers on my 83 to improve them. One thing I have not tried to do is upgrade the rear as much. The RSV's have a rather touchy rear brake system due to it is too good. This can cause bike to be high sided in a 'panic' type stop.

I am with Bob completly on cost can be high to rebuild caliper and skill level & tools needed. But there is such a thing as 'Too much brakes'.

This is primary reason I am very hesitant to let anyone ride Tweety (83), the front brakes on bike are far superior to any Venture, they are to the point they can be dangerous to someone not familar with high performance braking.

The MKII's have a rear quad piston caliper & a 320mm floating rotor. Pretty good setup when working well.

Gary

[bongobobny]

Woops!! Missed the word rear!! My bad!

 

 

The rear caliper on MK2's is the same one as 2nd gens. I think I have the one from my '09 before the trike conversion, I'l check and get back to you...

[Yammer Dan]

So would a 2nd Gen rear caliper improve 1st Gen rear brakes just a little. None at all. Or too much?? What makes them so touchy if same as 1st Gen 86-93?? Never did understand that part.

 

Shawn as Bob says I would just catch one on E-BAY and keep fingers crossed. Clean good before installing. I took a set from E-Bay completely apart cleaned them CAREFULLY put them back togather and never had any problem til I totaled the bike.

 

No brakes had nothing to do with accident....

[yooper]

So what are you saying? The 2 gen back caliper will fit on first gen with improve//// Yoopments?

[dingy]

So what are you saying? The 2 gen back caliper will fit on first gen with improve//// Yoopments?

 

 

I have both of them in the garage. I can set both of them on rear wheel of Hybrid this weekend & see if offset is the same.

 

Rotor diameter is the same I know 320mm. The caliper offset is probably the same.

 

I have an excel sheet I created showing info I have collected about various Yamaha brakes and it shows RSV has slightly smaller 'B' piston in rear caliper. This would lead to a little less force imparted on the pads on the RSV. Difference is about 12% greater on the MKII's.

 

PDF of sheet attached.

 

Picture shows an MKII rotor on a VMax wheel with an RSV caliper and mounted in an RSV swing arm. Don't try this at home kids !!!

 

Gary

[shawn]

I slpit the rear caliper the pistons were froze so I put wd40 let them sit.Only about 3/16 stuck out and didnt want to mar them up hopeing I could reuse them.i took a pair of padle c vise grips and they boke free and plunged all the way in.How can I get them out? I bought a vacume pump and pumped out sludgy oily ****.I put in fresh break fluid hooked the rear caliper up and set it by itsef on the swing arm and hit the break hoping the presure would bring the pistons out.I heard air gugling and found master cylender is leaking.That was my stop point will resume in morning.

[yooper]

Blow some air in them easyaly and you shouldnt have pushed them in all the way. My two cents been there. Yoop

[dingy]

Blow some air in them easyaly and you shouldnt have pushed them in all the way. My two cents been there. Yoop

 

Be cautious doing this. Use a c-clamp to gradually move piston out slowly. If you blow one out before getting other close, you then have no easy way of moving one still in caliper.

 

You need to clamp BOTH pistons & block off crossover passage.

 

Gary

Edited March 9, 2013 by dingy
spell

[dacheedah]

Been here done that, leave them together, cut some 1/4" thick wood shims to replace the break pads and drop them in the middle, you can use air to get the pistons to creep out 1/4" at a time. You can replace the inner and outer seals but don't pull or loose the o ring between. I would not use any harsh chemicals the air will move them. These things are like rockets if there is nothing in front of them, once one is out if the others aren't close you have a challenge getting the others out.

[MiCarl]

This winter I had the ruts the pads wore into my rear caliper welded up. To do that I split the halves so the heat wouldn't ruin the o-rings between them. In my case the o-rings were in good condition and I was able to re-use them.

 

The way I got all the pistons out was to put a block between one pair and clamp back one of the remaining pistons. I then used air to push the free piston out. To ease the piston out I use a stack of cardboard sheets cut from a corrugated box. Push the piston up against the stack, remove one sheet, repeat. Wrap a rag around the caliper when applying air so parts and brake fluid don't fly everywhere.

 

Once I had one piston out I reinstalled it without seals. I moved the clamp and block around to do the same to the other three pistons. Once the seals are out the pistons will drop right out of the caliper. This takes A LOT of air volume because they leak pretty severely without seals.

 

If you don't need them all out for cleaning then you can reinstall the first one with the new seals and work your way around to the others. Since you're not leaking lots of air you can get by with a smaller compressor.

 

**

Looking back I see you split your caliper. You'll need to reassemble it to get the pistons out by my method. I'm not sure there is any other way to do it without damaging the pistons. BTW, the book says they should be replaced if removed. I didn't replace mine and wouldn't hesitate to reuse if they're not pitted or scratched where the seals run. They'll be in poor condition near the pads, but the seals don't run there.

[tazmocycle]

pinwall e-bay store has several sets of rear calipers, also master cylinders too. you can read on the post of how many miles or on the unit, i saw an 05 wit a little over 13k on it. carbs looked really clean in photos.

[dingy]

I have both of them in the garage. I can set both of them on rear wheel of Hybrid this weekend & see if offset is the same.

 

Rotor diameter is the same I know 320mm. The caliper offset is probably the same.

 

I have an excel sheet I created showing info I have collected about various Yamaha brakes and it shows RSV has slightly smaller 'B' piston in rear caliper. This would lead to a little less force imparted on the pads on the RSV. Difference is about 12% greater on the MKII's.

 

PDF of sheet attached.

 

Picture shows an MKII rotor on a VMax wheel with an RSV caliper and mounted in an RSV swing arm. Don't try this at home kids !!!

 

Gary

 

The MKII caliper fit up exactly the same as the RSV caliper did on my project bike. Even though components are different on mine, this shows the MKII offset is the same as an RSV caliper.

 

Pictures attached. Caliper used was a front caliper, but I know the left front & rear are the same, other than bleeder screw location.

 

Gary