My replacement for Part #30620958 for V40 1.9T

Post by **shatayl7** » 04 Nov 2022, 20:17

After struggling after trying to find a replacement for the vacuum brake booster switch I decided to try a part that was easily accessible. This is a write up of what I did and the parts I utilized to replace part #30620958.

Parts List from Amazon
B003GBIJ5I (90 degree check valve going into Brake booster 1/2" booster end to 3/8" barbed end)
B003VAVMKI (90 degree Elbow Plastic for no corrosion issues)
B08FS47MQD (Replacement switch all barbs are 3/8")
B07NDVD19P (Heavy wall Silicone hose kit variety of sizes I had to replace some other rotten vacuum lines on the intake that's why I chose this kit as well as the different sizes for fitment there was plenty of hose for the job and the other lines I needed to replace Mostly used the 8mm was a tighter fit)
B07GDCH1YK (oetiker clamp kit was just my preference instead of worm drive clamps)

I chose the extra check valve at the booster instead of a 1/2" to 3/8" barb so i would have more options in rotating the parts to find a good spot for the new switch to sit. I also was not sure the valve would fit in the original position given that the barbs are straight and not angled like the OEM Switch. I Also reused the fitting connecting to the vacuum pump. After assembly the vacuum pump started to suck and shut off as it is supposed to after a certain vacuum was obtained. Brakes were back to full function at start up. Everything worked well on a test drive and it didn't seem that the hoses were routed in a manner that they would be subject to excessive heat. I hope this helps those who are in need of the part that volvo no longer makes.

eroman2000 · Post by **eroman2000** » 16 Mar 2023, 12:03

I just found your post and am going to give it a try myself. I have a 2002 S40 with a definite leak on this brake booster hose where it connects to the intake/throttle body, but figure it will all probably fall apart or break once I start trying to fix that. Thank you for this write up, and will let you know how it goes.

davidchecker · Post by **davidchecker** » 03 Nov 2023, 08:54

Absolutely terrific, thanks!

Stilltrying2 · Post by **Stilltrying2** » 20 Sep 2025, 16:05

re: Similar issue
Greetings,

After 24 years this hose failed at the Brake Booster end - just crumbling due to age. Please see attached.

I have checked all my sources (more than a dozen) and can't find the part anywhere = Part # 30616993,

I bought a bunch of exact or similar parts that fixed the problems.

If interested – send me a note and I’ll send you the parts list + sources.

Rregards,

Tom