Front brake shuddering

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2003stellaDave
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Joined: Tue May 30, 2017 6:31 pm

Front brake shuddering

Post by 2003stellaDave »

When I apply the front brake the is a strong vibration/shuddering thing going on. It’s slowly been getting worse. I took the front brake pads out and cleaned them with sand paper but the issue hasn’t changed.

2003 Stella.

Any thoughts? Anyone had this problem and fixed it?
Last edited by 2003stellaDave on Thu Jan 02, 2020 11:45 pm, edited 1 time in total.
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Mr.FixIt
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Location: York, PA, USA
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Post by Mr.FixIt »

Are the brake discs flat? Warped discs can produce this phenomenon. It seems unlikely, but what else could do it?
Eric
(aka Mr. Fix It)
2003stellaDave
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Post by 2003stellaDave »

The disc is fairly new - about a year or so old.
2003stellaDave
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Joined: Tue May 30, 2017 6:31 pm

Post by 2003stellaDave »

Well I think I’ve found the problem. I have some “play� at the front suspension link.

So...... has anyone removed the front suspension pin before? According to the Service Station Manual there is a fixture (19.1.20021) to remove the pin. Is there an easier way?
2003stellaDave
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Post by 2003stellaDave »

After searching online for a while, I think this may be a problem that’s not going away anytime soon.... :x
whereshaldo
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Post by whereshaldo »

I feel like I may have a similar issue. Can you post a couple of the links about what you found?

Hal
2003stellaDave
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Post by 2003stellaDave »

Manual from Scooterhelp. Page 61 onward is useful:

https://www.scooterhelp.com/manuals/VNX ... .man.r.pdf


Video in Italian but very good:

https://youtu.be/Jyw9IYrFnjw

I’ve ordered some tools and parts and will post pictures here if I get a chance.
Willie B
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Post by Willie B »

You might also check the headset bearings. This will also cause the front to shudder under braking if they're a bit lose
2003stellaDave
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Post by 2003stellaDave »

Willie B wrote:You might also check the headset bearings. This will also cause the front to shudder under braking if they're a bit lose
The headset bearings seemed Ok. Right now I’m thinking it was the two bearings in the caliper holder plate. I’m going to replace those, put everything back together and see how it runs.

Now I have everything apart, the fork suspension link seems ok.
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2003stellaDave
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Posts: 74
Joined: Tue May 30, 2017 6:31 pm

Post by 2003stellaDave »

Well I fixed it. It was the caliper holder plate bearings that got rusty and needed replacing. I ride all winter here in the PNW and it rains a lot. From now on I will have to check the front end every spring to clean and re-grease.

This was the first time I’ve removed the fork. The most difficult part was getting the headset off the fork - it needs to be lifted a couple of inches to clear the top of the fork tube and all the cables/wiring loom is holding it back. Putting it back together was easier.

One tool I bought that came in handy was the “Steering Head Bearing Nut� by SIP (BU5420). It allows the nuts holding on the fork to be torqued properly.

The front shock on the Stella is a great quality product but the design gets in the way if of removing the caliper. And you need to remove the caliper if you want to remove the wheel hub...... so I’m planning on saving up and buying a new shock asap.
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