I have built a 172 rally car and have been having issues with too much rear brake bias. I have removed the abs unit and have a proportioning valve fitted to the rear line but I still have too much rear brakes. My question is whether a non abs master cylinder will fit an abs 172 and if so will this have an affect? I have heard that removing the abs fuse will give 50/50 braking so I am assuming that a non abs car would have different valving to supply 70/30, 60/40 braking instead of using the abs unit to control the bias. I'm not allowed a peddle box in my regs or that would be next purchase.
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Rear brake bias
- Thread starter Stakkabo
- Start date
On the 172 Cup (which has no ABS) there is a brake compensator that reduces the effort on the rear brakes. It is not connected to the suspension so is always at its minimum bias.
Maybe you need to fit one of these.
Maybe you need to fit one of these.
In MR337 of the Renault repair manual section 38 there is a note:
'Important: If the ABS fuse is removed, be careful during road tests not to brake hard as the REF function is no longer activated (indentical front and rear pressure), so there is a risk the vehicle will spin.'
Without the proportioning valve connected on the rear line the car has 50/50 brakes. I have to set the valve to maximum reduction to bring the brakes near to a decent setting, but at this setting the valve seems to give a capacitive affect when holding the pedal over time and brings the bias back near to 50/50.
interesting, i bough mine used so i dunno how the removed the ABS, it does have a lever proportioning valve, i assumed the other ones didnt.
maybe u should change ur valve, i have no problem with unbalanced breaking at all and the valve is not full front bias.
Getting rid of evil ABS is a must.
172 Race Car
it does give 50/50 brakes. Tony Hunter can confirm this when we took the fuse out of mine and i sent him out to try it.
http://s210.photobucket.com/albums/bb167/Orange_Taxi/Ph1 Build/?action=view¤t=VIDEO_075.flv
How do people normaly do it when they remove the abs? Its on my to do list
http://s210.photobucket.com/albums/bb167/Orange_Taxi/Ph1 Build/?action=view¤t=VIDEO_075.flv
How do people normaly do it when they remove the abs? Its on my to do list
182cup & 172 racecar
172 Race Car
thats what i thought, sounds easy.
That's exactly what I have but still too much rear brakes. My car doesn't have a compensator as standard on the rear line, just the proportioning valve I fitted and a hydralic handbrake. The ABS has been removed.
