Angus25:
Look I was trying to say by having them on the drive and lift axles is to hold the vehicle when stationry and were im from even the single acting chambers are know as an sba even at the parts counter but as every thing on this web site exsperance counts for nothing
Sorry, that is not how it read. Spring brake actuators are just that, brake actuators with a massive spring piggy-backed on.
This is a link for a DAF XF front/steer brake actuator, as you will see there is no spring on the back
hgvdirect.co.uk/catalog/daf- … -4299.html
This is the link for the rear - this is the spring brake as you can see on the back - they are also much more expensive for tractor units although trailer spring brake chambers are cheap.
hgvdirect.co.uk/catalog/daf- … -4300.html
As a general rule of thumb, if you find yourself agreeing with Bking there is a 99.9% chance you will be wrong.