shakin' under heavy brakin'

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theruck

theruck

Joined
May 2, 2009
Messages
472
Location
Slovakia
hi fellas,
i noticed when i am braking hard just before the bike completely stops the whole front starts to shake. quite a lot. the pads are quite new - some 800 km on them only. does it mean my front wheel is deformed or the brake discs are gone? (33 000 km on them probably)if so, are there any recommended better than original brake discs around?
 
+1 on the bearings plus check the forks setup and oil levels.....mine did the same and it was a weeping fork seal combined with worn head bearings.
 
Have you removed the front wheel recently ? If so have you followed the correct refitting procedure ?:dunno
 
you mean the procedure of fiting it as it was before or is there some magic behind and i need to attend harry potter high school to be able to fit the front wheel to the axle?
 
theruck said:
you mean the procedure of fiting it as it was before or is there some magic behind and i need to attend harry potter high school to be able to fit the front wheel to the axle?
Click to expand...

Lol. No you don't need a wand pal. I had a similar problem a few years ago after having a new tyre fitted. After checking everything my mate removed the wheel and fitted it following the procedure in the hand book, the juddering went !! Have you removed the front wheel recently then ??
 
i have changed tyres few months ago so it could be the case. i will try to play a bit with tyre pressure if that makes any difference and will measure the discs
 
I had a similar feeling on one of my previous bikes. Turned out one of the pistons in the front caliper was sticking, and so when the brake was applied it was trying to bend the brake disc. The disc itself wasn't warped even though this was the obvious problem.
 
theruck said:
i have changed tyres few months ago so it could be the case. i will try to play a bit with tyre pressure if that makes any difference and will measure the discs
Click to expand...

I know I'm going on a bit :roll but just take the wheel out and re-fit it. The hand book way seems a bit long winded but it worked for me mate :thumbup
 
I would personally start checking that the discs actually float. Stuck "rivets" on discs maybe the reason.
 
I've had the front wheel on and off a fair few times and did it the way I've done it on literally hundreds of previous bikes, so what is different about the "hand book way"? (I don't have a hand book by the way!)
 
i will be changing the brake fluid this week so will check the calipers and discs. anyway are there some must have discs if i go for a replacement? i was looking at the braking mark (the wave ones)
 
anyone can recomend any brake discs? or shall i not hesitate and go directly for oem brembos?
 
id check the disc bobbins first and bearings !!

if money is no object brembo galfer braking are all good
 
I've got armstrong wavey discs, had them fitted for the last two years as the Brembo ones warped at a track day. Have been fine, no problems :thumbup

Front wheel fitting proceedure is, insert spindle, do up clamp bolts on L/H leg, tighten spindle nut to 80Nm, tighten R/H clamp bolts to 22Nm then slacken L/H clamp bolts, pump the forks up & down several times to ensure everything is seated in the correct position then re-tighten the L/H pinch bolts to 22Nm.

This wasn't done to mine after a tyre change by a main dealer & it blew the L/H fork seal after about 10 miles :eek: I was not amused to say the least especially as they would not take responsibility.

Also DO NOT tighten the clamp bolts on the Ohlins forks more than 22Nm or it can crack the casting, common problem & costs over £300.00 to repair :eek:
 
try cleaning the disc bobbins first with a a tooth brush and brake cleaner ( or soapy water ) then place a screwdriver in the centre of each bobbin and turn them until they move freely . Seized bobbins can be mistaken for warped discs

Eddie
 

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