PX150 disc break question
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PX150 and 1 drowned P200,
Joined: 28 May 2008
Posts: 3860
Location: Hustletown, TX
Tue May 14, 2019 8:52 am quote
Front brake on the "new to me" PX is a disc brake. It has very little power as you start to grab the lever and then gets really really grabby suddenly. At speed it is just dangerous causing severe jerking, dive, and whatnot. Anyone know what to look at first to remedy and smooth it out? Bike is 2005 so fluid change seems like the obvious starting point?

(Had a Euro market PX200 a few years back and the disc on that was powerful but buttery smooth... that is my only frame of reference.)

Molto Verboso
Joined: 26 Oct 2015
Posts: 1341

Tue May 14, 2019 9:00 am quote
I'd remove and lube the brake lever bolt at the headset first. Next, remove the brake pads from the caliper and check them for corrosion. If the steel backing plate on the pads are rusty, clean them up or replace them. Put a VERY thin film of Anti-sieze on the parts that slide (such as the guide pin, the edge of the brake pad, ect). Both those things are easy and cost nothing to do.

Just wondering, but since you used to have a Euro market PX200 AND you live in Texas, did that PX200 come from ASC by chance?
PX150 and 1 drowned P200,
Joined: 28 May 2008
Posts: 3860
Location: Hustletown, TX
Tue May 14, 2019 9:17 am quote
PX200 - I was the second private owner but yes, that is what I was told when I bought it.

Thanks for the disc brake 411 too!
PX 150
Joined: 06 Aug 2007
Posts: 255
Location: Dublin, Ohio
Tue May 14, 2019 12:22 pm quote
Just as a heads-up, be sure to use lots of painters tape around the sides of your fluid reservoir and extending around it before removing your reservoir cap and gasket. Brake fluid will quickly destroy paint and the reservoir on your PX150 is surrounded by painted parts. Plus, between the angle of the reservoir and the super small capacity, it is hard not to get spills. The low volume makes it tricky to keep from sucking the reservoir dry and getting air in the line if you use a vacuum at the bleeder on the caliper—I can attest to that. Having a person you trust who is not a moron would be helpful in keeping the reservoir topped up as you bleed fluid at the caliper.
'64 Motovespa 150S (177) , '76 V90 ( 133)
Joined: 27 Mar 2013
Posts: 527
Location: S.Salem, NY
Tue May 14, 2019 1:26 pm quote
never trust a moron
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