KNORR BREMSE Overflow Valve
MM1879
Quick Release Valves · Catalogue page 92
Refer to our sales team for compatibility details.
All products
Quick Release Valves repair kits
Quick release valve repair kits.
4 product lines · ManuMark 2026 catalogue
Fitting notice: Air brake components must be fitted by a qualified technician and matched to your vehicle’s exact part number.
4 products
JAPANESE Quick Release Valve
MM1906
Quick Release Valves · Catalogue page 92
Product details
AIR MASTER Shaft 16mm
Diaphragm – 45mm
MM22378
Quick Release Valves · Catalogue page 92
Refer to our sales team for compatibility details.
Diaphragm – 50mm
MM22378/1
Quick Release Valves · Catalogue page 92
Refer to our sales team for compatibility details.
About quick release valve repair kits
Quick release valves exhaust air close to the brake chambers so the brakes release quickly instead of venting through long lines.
When to replace
Slow brake release or a constant leak at the exhaust port is the classic sign of a worn quick release diaphragm.
What's in the kit
Quick release valve kits typically contain the diaphragm, seals and O-rings. All 4 quick release valves lines are manufactured by Pitchline Engineering in an ISO 9001 environment in Pinetown and supplied from our Pinetown branch across South Africa.
Quick Release Valves questions
Why are my truck brakes slow to release?
A sticking or leaking quick release valve diaphragm is one common cause.
Is a quick release valve the same as a relay valve?
No. A relay valve applies and releases using reservoir air; a quick release valve only speeds up the release.
Are quick release kits inexpensive to fit?
Yes. They are among the simplest air brake kits and often fitted during routine service.