JamesC Posted February 8, 2009 Share Posted February 8, 2009 My dads GS300 (same brakes as jap Supra) has got a pulsating kind of feeling when braking. We thought it would be simply the front discs warped so put new front discs and pads on today. Unfortunately it is still happening . What could this be? Rear discs? You don't get any wobbling through the steering wheel, just a kind of un-eveness in the braking. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted February 8, 2009 Share Posted February 8, 2009 Its the next logical step. Make sure the rear calipers aint siezed and touching the disc slightly, introducing a bit of heat. I think theyre the same as Soarer brakes and Ive had issues with siezed rear calipers before Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted February 8, 2009 Share Posted February 8, 2009 check for crap on the hub face, crap on them can cause problems that feel like warped dics. Quote Link to comment Share on other sites More sharing options...
JamesC Posted February 8, 2009 Author Share Posted February 8, 2009 Its the next logical step. Make sure the rear calipers aint siezed and touching the disc slightly, introducing a bit of heat. I think theyre the same as Soarer brakes and Ive had issues with siezed rear calipers before Siezed caliper on the back? I dont think it's a siezed caliper on the front as they were spinning freely when we jacked it up, and went back fairly easy. check for crap on the hub face, crap on them can cause problems that feel like warped dics. If it was crap on the hub face would you not feel it all the time? Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted February 8, 2009 Share Posted February 8, 2009 If it was crap on the hub face would you not feel it all the time? You might do if the piston wasn't retracting all the way back of the face of the disc but I think most of the time you would only feel it when you brake. The uneven face of the hub makes the disc sit very slightly off which would cause pulsating when the pad is pressed onto the disc as it goes over the high spot again and again, kicking the piston back again which you would feel through the pedal. Just a thought though. Quote Link to comment Share on other sites More sharing options...
Milton79 Posted February 8, 2009 Share Posted February 8, 2009 this is a common fault on the gs300, its your abs pump thats not working. pumps are over 1k from lexus/toyota. see if you can find a 2nd hand one from ebay or breakers for around £200. i have gone through 6 lexus gs300 and 3 times i have lost abs pump. its very common. and that IS the symptom!!!! john Quote Link to comment Share on other sites More sharing options...
garethr Posted February 8, 2009 Share Posted February 8, 2009 The Aristo/GS seems to be very sensitive to "warped discs". We finally eliminated it on my GS by scrupulously cleaning the mounting face (and getting the motor factor to replace the discs under warranty). Quote Link to comment Share on other sites More sharing options...
JamesC Posted February 9, 2009 Author Share Posted February 9, 2009 this is a common fault on the gs300, its your abs pump thats not working. pumps are over 1k from lexus/toyota. see if you can find a 2nd hand one from ebay or breakers for around £200. i have gone through 6 lexus gs300 and 3 times i have lost abs pump. its very common. and that IS the symptom!!!! john John, does this mean that the ABS wouldn't be working? The ABS definately works as it's cut in on the snow. The Aristo/GS seems to be very sensitive to "warped discs". We finally eliminated it on my GS by scrupulously cleaning the mounting face (and getting the motor factor to replace the discs under warranty). I might have to give this a go! Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted February 9, 2009 Share Posted February 9, 2009 Is it the abs pump or the electric pump brake assister. Be better off looking on the lexus or aristo forum for the answer to this question as the braking system is quite different to the supra's even though the J-spec calipers are the same. Quote Link to comment Share on other sites More sharing options...
Scooter Posted February 9, 2009 Share Posted February 9, 2009 this is a common fault on the gs300, its your abs pump thats not working. pumps are over 1k from lexus/toyota. see if you can find a 2nd hand one from ebay or breakers for around £200. i have gone through 6 lexus gs300 and 3 times i have lost abs pump. its very common. and that IS the symptom!!!! john Just to clarify this is on the mk2 (twin headlight curvier shape S reg on) yes? Quote Link to comment Share on other sites More sharing options...
Milton79 Posted February 9, 2009 Share Posted February 9, 2009 yes mate, basically 1998 onwards.... Quote Link to comment Share on other sites More sharing options...
Milton79 Posted February 9, 2009 Share Posted February 9, 2009 hi have also had the same symptom on the Lexus RX300 range but on them they always seem to be the abs sensor itself. as you can see, i love my lexus Quote Link to comment Share on other sites More sharing options...
JamesC Posted February 10, 2009 Author Share Posted February 10, 2009 Can the pump be tested? It's going into the garage today for a full service so will ask them to try and tesst it. Quote Link to comment Share on other sites More sharing options...
D8MOA Posted February 11, 2009 Share Posted February 11, 2009 this is a common fault on the gs300, its your abs pump thats not working. pumps are over 1k from lexus/toyota. see if you can find a 2nd hand one from ebay or breakers for around £200. i have gone through 6 lexus gs300 and 3 times i have lost abs pump. its very common. and that IS the symptom!!!! john doubt it..... all the lights etc would come up if that was at fault. ide say 90% rear discs warped Quote Link to comment Share on other sites More sharing options...
Milton79 Posted February 11, 2009 Share Posted February 11, 2009 doubt it..... all the lights etc would come up if that was at fault. ide say 90% rear discs warped unfortunatly not, it would only throw up an abs light, thats it. i have had a couple gs300's where the light bulb behind the dash has been removed also..... Quote Link to comment Share on other sites More sharing options...
D8MOA Posted February 11, 2009 Share Posted February 11, 2009 (edited) ?? you must have a rare case then!! when the abs pump goes the abs/vsc/traction light all come on. you get a buzzing noise from the pump itself! the abs and tractions systems dont work! my current mk2 gs300 thats my everyday car has a pedal pulse and its the REAR discs http://www.lexusownersclub.co.uk/forum/index.php?showtopic=23114 (hope its ok to link to another site?) thats what happens when the pump goes Edited February 11, 2009 by D8MOA (see edit history) Quote Link to comment Share on other sites More sharing options...
JamesC Posted March 6, 2009 Author Share Posted March 6, 2009 doubt it..... all the lights etc would come up if that was at fault. ide say 90% rear discs warped I changed the rear discs last weekend, all sorted now Quote Link to comment Share on other sites More sharing options...
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