- Thread starter Pavel
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nicky4tl
Enthusiast
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- 190
Hi,
Malcolm outlines some of his thoughts and experience here
http://www.renault4.co.uk/gordini-brakes.htm
This also contains a link to a prior discussion on the forum.
http://www.renault4.co.uk/forum/showthread.php?t=174
Hopefully thats useful.
N
Malcolm outlines some of his thoughts and experience here
http://www.renault4.co.uk/gordini-brakes.htm
This also contains a link to a prior discussion on the forum.
http://www.renault4.co.uk/forum/showthread.php?t=174
Hopefully thats useful.
N
Cornish4
Le Dazzleur
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- Falmouth
Hello Pavel, I'm not sure that a servo is really necessary on a standard R4 fitted with front disc brakes as they are very effective as they are. A servo doesn't actually improve the brakes, it just means that less effort is required to operate them. The reason of course that Malcolm fitted a servo to his car was that he was seriously modifying it. Good idea though to fit discs. Regards Brian.
Hi Nicky, thank you for the links. Of course, I saw the Malcolm´s remote booster there in the picture. However I don´t understand, how to connect the brake pipes to the remote booster. I´m not heaps cleverer after the read-through the problem in the discussion, as mentioned above. May be, there is a hydraulic diagram anywhere in internet?
Best regards Pavel
Hi Brian, thank you for your reply. Of course, I haven´t any experiences wit disc brakes on R4. I find the drum brakes as very deficient in contemporary city traffic. However the similar disc brakes on Renault 12 have quit faint effect too, as I know. So I thougt, the booster should be helpful.
Best regards Pavel
Cornish4
Le Dazzleur
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Yes I understand what you are saying Pavel, and if you drive in the city most of the time of course you need very good brakes. I would say the R12 was a lot heavier car than a 4 and maybe the brakes on that particular car weren't as good as they could have been. I take your point though, you need all the help you can get in modern city traffic. Didn't the R5 have a servo assisted braking system? Maybe if you can get hold of a diagram of that system that might give you the info you need.
malcolm
& Clementine the Cat
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For a remote servo like mine use the single circuit master cylinder from before 1981. There are three pipe outlets in the master cylinder. I blanked 2 off with bleed nipples. The master cylinder needs to be machined for the bleed nipples (drill bit is about the right angle).
The single pipe went into the servo and a single pipe came out. The servo was from an MGB.
From there a 4 way junction is needed to separate to 2 front brakes and 1 to the rear brakes.
The remote servo only suits single circuit brakes from before 1981. For dual circuit brakes in the GTL a Renault 5 servo is needed before the master cylinder. Some people have fitted them but I've not tried.
The single pipe went into the servo and a single pipe came out. The servo was from an MGB.
From there a 4 way junction is needed to separate to 2 front brakes and 1 to the rear brakes.
The remote servo only suits single circuit brakes from before 1981. For dual circuit brakes in the GTL a Renault 5 servo is needed before the master cylinder. Some people have fitted them but I've not tried.
allez-y
Enthusiast
- Messages
- 42
Hi
Agree with Cornish4 that servo is not needed as it doesn't influence breaking force, but assists the driver's leg only. Knowing that pressure in the servo is permanent whether we break or not, I think that's additional load to this small engine, again w/o real need.
Agree with Cornish4 that servo is not needed as it doesn't influence breaking force, but assists the driver's leg only. Knowing that pressure in the servo is permanent whether we break or not, I think that's additional load to this small engine, again w/o real need.
jeffr4
senior tool assistent
- Messages
- 70
I agree with Cornish4 and Allez-y, although I have a super5 1.4 monopointinjection engine build-in and the R4 can drive very fast etc...the brakes are okee.
There is a stand-alone type of dual remote servo and I think it's available/supplier in Engeland too. Made by a large specialist braking manufacturer in Spain, this is the only remote twin circuit (dual circuit) servo that I know of.
Let me find out.
There is a stand-alone type of dual remote servo and I think it's available/supplier in Engeland too. Made by a large specialist braking manufacturer in Spain, this is the only remote twin circuit (dual circuit) servo that I know of.
Let me find out.
DavidN
Enthusiast
- Messages
- 488
I just found that ...
AMPLIFICATEUR DE FREINAGE RENAULT 4/5/6
Maybe it is of some use for your project?
Cheers,
David
AMPLIFICATEUR DE FREINAGE RENAULT 4/5/6
Maybe it is of some use for your project?
Cheers,
David
angel
Enthusiast
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- 2,507
- Location
- Athens, Greece
It cannot be fitted on a R4, it is for direct fitment behind the master cylinder.
French people called the remote servo as "Hydrovac". I think it is better to look for a Lockheed remote servo, they had been available in various sizes. Go for the small one, as fitted to Minis, as it is easy to end over-servoed with such a light car.
French people called the remote servo as "Hydrovac". I think it is better to look for a Lockheed remote servo, they had been available in various sizes. Go for the small one, as fitted to Minis, as it is easy to end over-servoed with such a light car.
What I reckon you need is a remote booster as Malcolm said: this page shows some available in Australia, there would be local equivalents in the UK and Europe.
http://www.hydroboost.com.au/boostertypes.htm
I put one (or rather PBR, the OEM, did it)- a VH44- on the front circuit only of a standard late model R4 dual circuit master cylinder, with standard drum brakes and new non-asbestos linings. It made a huge improvement. The booster is mounted remotely, on mine it's in front of the radiator.
The booster lterally just goes in line in the circuit you want to boost. If you want the rears done too, you can put another booster on that circuit.
Bear in mind the rear brakes don't do much and if you overboost them the pressure limiting valve will only stop it anyway. If you are going to a VH44 on the rear you would probably want to put a bigger VH40 on the front to give it the right mix.
As an illustration, Right hand drive Alfa Romeo 105's with all disc brakes had the master cylinder under the floor, mounted on the chassis rail. Early single circuit cars used one VH40 and dual circuit cars used two VH44's, mounted under the bonnet. People doing club racing would put the VH40 on the front.
http://www.hydroboost.com.au/boostertypes.htm
I put one (or rather PBR, the OEM, did it)- a VH44- on the front circuit only of a standard late model R4 dual circuit master cylinder, with standard drum brakes and new non-asbestos linings. It made a huge improvement. The booster is mounted remotely, on mine it's in front of the radiator.
The booster lterally just goes in line in the circuit you want to boost. If you want the rears done too, you can put another booster on that circuit.
Bear in mind the rear brakes don't do much and if you overboost them the pressure limiting valve will only stop it anyway. If you are going to a VH44 on the rear you would probably want to put a bigger VH40 on the front to give it the right mix.
As an illustration, Right hand drive Alfa Romeo 105's with all disc brakes had the master cylinder under the floor, mounted on the chassis rail. Early single circuit cars used one VH40 and dual circuit cars used two VH44's, mounted under the bonnet. People doing club racing would put the VH40 on the front.