Clutch Hydraulics

The hydraulic clutch release systems are based on the same principle as hydraulic brakes. The hydraulic system consists of a transmitter (clutch master cylinder) a hose and a receiver. The clutch master cylinder is connected to a plastic or a metal tank filled with hydraulic fluid. The tank is either common between the clutch and the brake master cylinders or separate.The receiver, depending on the application, can be a clutch release cylinder (semi-hydraulic system) or a concentric slave cylinder (full hydraulic system).

 

Why hydraulics?

The mechanical clutch release system consists of a release bearing that is operated by a fork. The fork is attached to a clutch cable operated by the driver’s foot via the clutch pedal. Cars have become lighter and more compact. Car manufacturers demand reduced pedal load linked to comfort reason.

Hydraulic systems become mandatory in such cases as they also provide benefits compared to the manual system, increasing efficiency of the actuation with less space required. For these reasons, one vehicle out of two is equipped with a hydraulic system today.

 

Benefits of hydraulic technology:

  • more flexible and reliable compared to cable systems
  • enable an optimal and constant pedal effort
  • used material is much lighter -up to 70% reduction of weight compared to the standard clutch system command -  as well as much more compact.

The hydraulic systems benefits lead the car markers to implement that technology on OE projects - one vehicle out of two is equipped with a hydraulic system today. 

Added values

Growing market - Valeo offers you a complete solution for hydraulic systems

Depending on the application Valeo proposes the large offer for semi-hydraulic and full hydraulic system with clutch master cylinder (CMC), clutch release cylinder (CRC) and clutch slave cylinder (CSC).

 

CLUTCH RELEASE CYLINDERS (C.R.C)

Semi-hydraulic

CRC is very easy and quick to replace as it is always located outside the transmission housing (about 30 min replacement for professionals).

CLUTCH MASTER CYLINDERS (C.M.C)

Semi-hydraulic / Full hydraulic

The new clutch master cylinder generation with sensor is commonly used on applications equipped with electronic hand brake, cruise control or start & stop function.

CONCENTRIC SLAVE CYLINDERS (C.S.C)

Full hydraulic

Advantage of the CSC is to eliminate the fork and the release bearing benefiting in weight reduction by 70%.

Our Offer

Discover our selected Valeo clutch hydraulics and many more in our catalogs…

Clutch kit 

Valeo part Application for Year OES cross Product Category
828142 FIAT PUNTO 1.3/ LANCIA Y 1.3 2005 71734221 Clutch kit 3P
828111 FIAT Bravo, Brava 1.9 JTD 2000 71713714 Clutch kit 3P
801977 FIAT BRAVO 2.0 1998 71734767 Clutch kit 3P
821183 RENAULT CLIO- MEGANE- KANGOO 1998 302055852R Clutch kit 3P
821357 ALFA 147- 156 2.0TS SELESPEED 2000 0071784538 Clutch kit 3P
801001 PSA XANTIA-XM-ZX-306-405-605 1988 2004N0 Clutch kit 3P
826326 VW BORA / GOLF 1.6 FSI 2002 036198141BX Clutch kit 3P
826991 ALFA 159, Spider 2.2 JTS 2006 55212335 Clutch kit 2P
801496 CITRON BX, XANTIA 1988 2052-99 Clutch kit 2P
828012 RENAULT Megane2 Clio3 1.5d 2002 302055016R

Clutch kit 2P

 

Clutch bearing 

Valeo part Application for Year OES cross Product Catagory
804746 FIAT Doblo Gde Punto ALFA 147 2000 55196189 CRC
804745 FIAT Stilo, Punto, LANCIA Y 1999 55196190 CRC
804513 DAEWOO EVANDA 1003 96286828 CSC
804581 LANCIA Delta (08>) 1.8 2008 55243920 CSC
810039 Chevrolet Cruze Eco 1.4/1.8 11-12 2011 5679350 CSC
804527 Nissan Versa 1.6 2009 2009 30620-00Q0E CSC
810070 FIAT Gde Punto (05>) ALFA 159 2005 5679356 CSC
810086 CLIO 3 MEGANE 2 LOGAN 2010 8200046102

CSC

TechCorner

TechCorner

The clutch release cylinder (CRC) may need to be replaced if:

  • The push rod does not return correctly when compressed right image
  • There is a leak from the surface

 

The clutch master cylinder (CMC) may need to be replaced if:

  • The clutch pedal slowly sinks to the floor and does not return
  • There is a leak from the surface

If you change the clutch master cylinder, it is recommended to change the slave cylinder (CSC) at the same time, as both units typically fail around the same time. 

 

The concentric slave cylinder (CSC) may need to be replaced if:

  • The clutch pedal does not return
  • Noise in cold engine and neutral position; noise disappears once the pedal is pressed:
  • Extra stroke; piston goes over its stopper
  • Oil contamination

Valeo Tip

In almost all cases, the clutch fluid is the same as the brake fluid. However, if the reservoir is different, see your car owner’s manual to find out what grade of fluid your car requires right image.

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