View Full Version : rear calipers
ok i am having problems with mine at the moment and
mot man says NO :?
basicly the rearn braking efficeny is not up to mot standard even
though i have no problems with them including the handbrake efficency.
now i have removed , pads and discs in order to inspect calipers
properly ,the rubber seals were not looking to clever took them out to
check picton movement , it was difficult but pulled them out and wd40 ed
them as i worked them in and out . put everything back on even though
it did help bring the efficeny up it still is not enough for mr MOT .
my bias valve is not seized either so the only problem i can think of
is the air in calipers which needs to be bled . however i snapped one
of the bleed nipples and dont want to go any further without a proper plan .
here are the questions ;
1- has anyone heard of/managed to bleed rear calipers through union nut by simply slackening the nut instead of the bleed nipple ?
2- the nipple is snapped flush wit hthe caliper casing .what are my chances
of getting it out without damaging threads or getting crap into the caliper?
katbloke
28-07-2010, 15:10
Q1, it can be done through union not sure if will be 100% efficient
Q2 Some people will braze a nut onto belled nipple to make it easier to turn that in conjunction with oxy/acetylene (sp) might work, a good soak with a better than wd40 fluid like ferrorosol (built-hamber) or similar might free it up enough to be able to wind a screw extractor in but if it snaps they are practiacally undrillable. You could drill it out making sure your drill bit is smaller than the diameter of the hole that way the threads should clean up easily with a scrape out or a retap, make sure all drill particles are removed.
http://www.tonybmw.co.uk/pages/project_m/projectm_rearcaliper.html
Might inspire might not
i have spare rear calipers if you want to purchase some pal
would be easier to pt new ones on to be fair mate or bung mr mot man a tena, :)
thanks guys but i am not going to be buying new or used calipers to
replace them at the moment .
thinking about it today ,i have a nice theory ; calipers are made of
ally ,bleed nipple is steel . i will try to build up some welds over the
remains of the nipple on the caliper , weld wont stick to ally but will melt and stick to the nipple if i can build it high and strong enough ,i can weld a nut
on the end of it and unscrew the fooker out (IN THEORY )
obviously heat from wleding process will help loosen the threads but too much of it can burn the brake fluid . planning to cool the welds with compressed air as i go along . :idea:
wat calipers u using mate, i got a spare set of williams/16v calipers if u need them??
where did u take it for mot, did they give u a print out or the readings??
wat calipers u using mate, i got a spare set of williams/16v calipers if u need them??
where did u take it for mot, did they give u a print out or the readings??
hi mate
took them to ETB on cardiff road as my mate takes all his cars there .
but there is new mot tester there at the moment he is a complete CNUT !!!
i took a 2001 clio 1.2 down there for the test , he came up with 8 items on it .
fixed all took it back for retest and failed . it failed on front discs and pads which were not even mentioned on the actual mot failure sheet !!
the car has only been to garage down the docs since the mot .
i had to buy new discs and pads to get it passed .
calipers are the same as clio ones .
are the nipples free on them calipers ?
i have not got a print out but i have seen the rear braking figures on the screen . like i said even though the car stops perfectly fine and handbrake holds it nicely . he wont pass it untill he gets the figures he is after . TOTAL CNUT !!
yea the tester that was there has gone bak to national in cardiff, he's had my old job lol. has he only failed it on the rear then or has he failed it on overall brake efficency. i'll check the calipers for u mate an let u kno :wink:
ok brake efficency at the front calipers are around 300kgf
where as the rears have arounf 60-70 kgf a side .
mot guy says he would expect at least 120 kgf a side to pass .
i forgot to ask him this but do mot testers work with expectations or
is there a document that states what figures are needed for each type /model of car ??
Justin..
30-07-2010, 16:43
http://www.motuk.co.uk/manual_380.htm
http://www.ukmot.com/3-7.asp
ok brake efficency at the front calipers are around 300kgf
where as the rears have arounf 60-70 kgf a side .
mot guy says he would expect at least 120 kgf a side to pass .
i forgot to ask him this but do mot testers work with expectations or
is there a document that states what figures are needed for each type /model of car ??
theres no documents that list brake readings wats the testers name?? he shouldnt of failed them for being 60-70 each side, unless the overall service brake efficency is below 50% or handbrake below 16%.
wat does it actually say on the failure sheet??
http://www.transportoffice.gov.uk/crt/doitonline/bl/mottestingmanualsandguides/mottestingmanualsandguides.htm
thats the mot inspection manual that every mot test centre will use, as it is the only one VOSA hav brought out, hav a read through it and if u hav to print sum pages out and go bak to the tester.
cooper, the hand brake efficeny is 15% , i have just put new discs and pads on there before i went for a retest though and he confirmed i need 1 more percent to get there .
dont know his real name , we call him the cnut at the moment .
i will get the failure sheet and find his name tomorrow .
you reckon i should go to rims ?
sounds like a abit of a cnut, 1%!!!
i thought he would of been abit leaneant seeing that u'v put new discs and pads on which will take sum time to bed in :?
do u kno any 1 in rims?? i kno 1 of the testers there, thats even if he's still there, but i havent spoke to him for a while and havent got his number to ring him for u :(
sounds like a abit of a cnut, 1%!!!
i thought he would of been abit leaneant seeing that u'v put new discs and pads on which will take sum time to bed in :?
do u kno any 1 in rims?? i kno 1 of the testers there, thats even if he's still there, but i havent spoke to him for a while and havent got his number to ring him for u :(
i know mark at rims , he is on holiday though apparently.
dont know the other mot tester in there but surely he cnut be as cnut
as the one at ETB .
on the other hand though , pedal feels a bit spongy i am pretty
sure rears need bleeding . i will give it another shot through the
brake unions as both bleed nipples are snapped :cry:
took it for a fresh new test at RIMS today .
she passes first time !!!!
WHOS MA BITCH NOW !!! :D :D 8) 8)
yay, who tested it?? was the readings better than etb said??
yay, who tested it?? was the readings better than etb said??
tested at RIMS mate .
i dont know if there is truth in it but apparently ETB has the later style
digital test equipment for brake test where as RIMS have the older style
spring operated one .
dont car about readings tbqfhwu ,she passed mot ,brake pedal feels
much better after bleeding and the stops as she should .
on the other hand she will only be on the road for another week or so
before the 9 comes out to play :D
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