Mud-club

Vehicle & Technical => Series Land Rovers => Topic started by: paulmmc on October 24, 2009, 22:51:47

Title: What's this bit called?
Post by: paulmmc on October 24, 2009, 22:51:47: What is the proper name for this part of the brake system from my S3? Is it a shuttle valve?

Thanks, Paul
Title: Re: What's this bit called?
Post by: MudLifeCrisis on October 24, 2009, 23:58:24: Sorry can't answer the question but nice to see someone else from St Albans on here.
Brian
Title: Re: What's this bit called?
Post by: TBM on October 25, 2009, 12:47:36: http://www.lrseries.com/shop/product/listing/14123/NRC4880-BRAKE-SYSTEM-PDWA-VALVE.html?search=nrc4880&page=1 (http://www.lrseries.com/shop/product/listing/14123/NRC4880-BRAKE-SYSTEM-PDWA-VALVE.html?search=nrc4880&page=1)

Often called a Shuttle Valve but correctly called a PDWA valve. Part number NRC4880

They can cause problems when bleeding and many bypass them.
Title: Re: What's this bit called?
Post by: bogie on October 25, 2009, 18:48:06: Far as i know it aint a good idea to bypass the shuttle valve as it loweres the pressure to the rear brakes so ur back end doesnt kick out when braking hard and if your rear brake line gets damaged it isolates the front so you still have front brakes to stop,but dont hold me on this !
Title: Re: What's this bit called?
Post by: TBM on October 28, 2009, 09:06:06: Quote from: bogie on October 25, 2009, 18:48:06
Far as i know it aint a good idea to bypass the shuttle valve as it loweres the pressure to the rear brakes so ur back end doesnt kick out when braking hard and if your rear brake line gets damaged it isolates the front so you still have front brakes to stop,but dont hold me on this !

It doesn't lower the rear pressure but it does isolate the front or rear circuit if there's a break in a line. Bypassing turns it into a standard single line circuit like on the older Land Rovers.
Title: Re: What's this bit called?
Post by: fordlltwm on October 30, 2009, 16:49:41: Quote from: TBM on October 28, 2009, 09:06:06
Quote from: bogie on October 25, 2009, 18:48:06
Far as i know it aint a good idea to bypass the shuttle valve as it loweres the pressure to the rear brakes so ur back end doesnt kick out when braking hard and if your rear brake line gets damaged it isolates the front so you still have front brakes to stop,but dont hold me on this !

It doesn't lower the rear pressure but it does isolate the front or rear circuit if there's a break in a line. Bypassing turns it into a standard single line circuit like on the older Land Rovers.

Nope, other shuttle valves do, but a standard LR one just switches on the light on the dash that says BRAKE, rather foolish but that's BL quality design for you
Title: Re: What's this bit called?
Post by: bogie on November 03, 2009, 18:39:46: THIS IS GETTIN CONFUSIN! Which ones do what then???????????????????????????
Title: Re: What's this bit called?
Post by: fordlltwm on November 04, 2009, 18:48:16: The OP's bit just switches a light on the dash that tells you your brakes a failing when theres a missmatch in front and back pressures, such as a leak
Title: Re: What's this bit called?
Post by: bogie on November 04, 2009, 19:39:53: So basially you might as well f it off because you dont need a stupid light to tell you that your brakes are failin! You put your foot down which operates the light if they fail,but your foot would already be telling you this!