£0.00
(0)

Don’t wait until your brakes stop, change your hoses!

Next time you have a problem with your brakes, you may want to check your hoses. Matt explains the complications which can occur from not changing hoses regularly.

“Hi there & welcome back. Today I am going to talk about brake hoses. These are Rolls-Royce Silver Shadow brake hoses as we have spoken about before, the Silver Shadow models have a high pressure braking system. What happens is that the system is pressurised and when you put your foot on the brake you’re opening a valve and that allows the pressure to flow into the calipers. They go through solid pipes up until the point where there is movement from the calipers to the body at which point they have a flexible hose. The flexible hose then takes that pressure into the caliper.

The reason why you should change these hoses at regular intervals is because they have a tendency to swell up internally, so while the pressure can get through the hose into the caliper, due to the swelling it can’t get back because there is a restriction. So what that means is that your calipers will stay pressurised and hold the brakes on. What happens with that, for example the back brakes they get locked on, all the grease then gets melted in the hub because the brakes get hot and then your bearings run dry & then you are in for a complete hub rebuild rather than just a change of brake hoses.

These hoses are on two service schedules: the 60,000 & 90,000 miles but also at the respective years. You’ve got 4 front hoses (CD6242) then you’ve got two on each of the rears. You’ve got 4 front calipers so one hose for each caliper (CD6248, CD6247, CD6243, CD6244), you’ve only got two rear calipers but each rear caliper has got two separate systems internally and they’ve got 4 pistons on each caliper. Then you’ve got the pedal hoses, these are sometimes forgotten about. These are the ones that go from the front sub frame to the rat trap mechanism where the distribution valves are, and then you’ve got some height control hoses (CD6244) as well. One thing to mention on the height control hoses if the return line gets blocked on the height control line, it can actually force a build up pressure in the height control valve and push out the plug and damage the casing. That means that you are going to lose your surcharge on the exchange unit if you ever have to replace your height control valve because it will be broken & it can’t be used again.

The way these are fitted on most of them; you have a pipe with a flare and a female union that screws over this and tightens up the pipe on to the end of the hose here. You then have a lock nut on a bracket which holds the hose in place. On some of them they have a slightly different set up where they screw directly into a sort of junction block or box for the hydraulics and you have a copper washer on this shoulder so they have not got a lock nut, they just screw straight in, that is how it is on the rat trap hoses and also on one side on the back. Notice as well this hose.. this must be one that runs near the exhaust so it’s got this protective coil around it.

These hoses are to be used with RR363 brake fluid. They have an almost identical setup for the Rolls-Royce Silver Spirit and Bentley Turbo onwards from 1980 for the mineral cars except when ABS braking was introduced; they went to a single hose on the front which then has a bridge across the calipers to spread the fluid.  These should only be used with RR363 & obviously the mineral oil ones should only be using mineral oil. If you mix the wrong fluids up that will cause them to swell up and perish.

A very common problem people call up with it is to say that the brakes are sticking on and 95% of the time it’s because the hoses are blocked or there is a restriction in the line. So we offer four different kits; you have got an early and a late and a left hand drive and a right hand drive. The early and the late ones have a different amount of hoses on the height control system. I think the later ones only have three and this is an early set with four. The left hand drive and right hand drive differ because the rap trap hoses are different. So obviously the rat trap is under the pedal, it’s moved by the pedal, so on the left hand drive cars they move it to the left hand side and they just have slightly different hoses. All kits are available to order and available on the website.

The only thing I say you might run into problem with is the pipe work that goes into the hoses. Sometimes it can be very old and rusted and you may have to change the pipes. You can’t buy the original pipes anymore. Now we offer a roll of copper pipe and the unions & you need to cut and flare that pipe and shape it. Because they are such a complicated hydraulic system on these cars, there is a lot of pipe work to run so it is not a job that you want to undertake lightly. Over the last few years we have done a couple of contamination sets, where someone has put the wrong oil in and they had to basically replace every rubber component in the hydraulic system, whether they have done kits or they have replaced complete components, it is a big job and it is not one you want to have to do. I think that’s pretty much it for the hoses, but of course if there are any questions please feel free to comment and we will respond”.

Part NumberDescriptionApplicationPrice (excl. VAT)
SSHYDHSKT1Right Hand Drive Brake & Height Control Hose SetAll right hand drive car models from 1965 to 1980 with chassis between 1001 and 7404£157.40
SSHYDHSKT2Right Hand Drive Brake & Height Control Hose SetAll right hand drive car models from 1965 to 1980 with chassis between 7405 and 42000£134.73
SSHYDHSKT3Left Hand Drive Brake & Height Control Hose SetAll left hand drive car models from 1965 to 1980 with chassis between 1001 and 7404£165.60
SSHYDHSKT4Left Hand Drive Brake & Height Control Hose SetAll left hand drive car models from 1965 to 1980 with chassis between 7405 and 42000£154.25
GMF1323-4KITBrake Caliper Hose BundleRolls-Royce Silver Spirit (chassis numbers 07661-16930), Silver Spur (chassis numbers 07634-16970) & Corniche (chassis numbers 07814-16968)

Bentley Mulsanne (chassis numbers 07661-16930) & Eight (chassis numbers 08862-16954)
£170.24
GMF1323-4KIT2Brake Caliper Hose BundleRolls-Royce Silver Spirit, Silver Spur & Corniche (from chassis 20001), Silver Dawn, Flying Spur & Touring Limousine

Bentley Mulsanne, Eight, Turbo R & Continental (from chassis 20001), Continental R, Continental T, Continental SC & Azure
£126.18
GMF1181-1324KITRHDBrake Caliper & Distribution Valve Hose BundleRolls-Royce Silver Spirit (chassis 01001-07567), Silver Spur (chassis 01006-07456) & Corniche (chassis 05037-07813)

Bentley Mulsanne (chassis 01001-07567) & Continental (chassis 05037-07813)
£341.40
GMF1181-1324KITLHDBrake Caliper & Distribution Valve Hose BundleRolls-Royce Silver Spirit (chassis 01001-07567), Silver Spur (chassis 01006-07456) & Corniche (chassis 05037-07813)

Bentley Mulsanne (chassis 01001-07567) & Continental (chassis 05037-07813)
£283.02

Check the RR – Technical Video Library for more.

Tags: , , , , , , , ,
Posted in RR Technical - Rolls-Royce & Bentley
Pin It

Comments are closed.