1998 Volvo S70 T5 - Cruise Control Brake Switch

Gerd · Post by **Gerd** » 18 Sep 2020, 10:54

Hi all. After reading a number of times that the 1998 doesn't have a brake cruise control switch and checking everything else to get my cruise working, I was driving down the road and decided to pull up brake pedal and check cc. It worked. Maybe mine is a late in the year production or something.

Anyway, I pulled the plunger out with the brake depressed and went for a drive and engaged cc and all good. Until I used the brake. Then it quit working. Have done same thing a few times and it won't lock in place.

Do I need a new switch or is there a fix to lock plunger in place?

Thanks

Gerd · Post by **Gerd** » 20 Sep 2020, 09:14

I thought I had it by adding some washers to brake pedal arm to depress the switch. And it worked. Once. Again, as soon as I hit the brake, it wouldn't engage anymore.

Thoughts...?

Gerd · Post by **Gerd** » 20 Sep 2020, 09:37

It occurs to me that maybe the issue is the 'ratcheting' the plunger is making as once it is pushed back in, it just stays. Is it supposed to work that way?

Post by **abscate** » 20 Sep 2020, 10:46

It should go in and out to send the correct signal TJ the ECU

Gerd · Post by **Gerd** » 20 Sep 2020, 13:01

ok, thanks. It must be history then.

I'll get on to fcp tomorrow.

Post by **RickHaleParker** » 20 Sep 2020, 19:56

Reach up and push the switch back into it's bracket. Over time they slip out of place.

Gerd · Post by **Gerd** » 20 Sep 2020, 20:06

Okay. I’ll give it a shot tomorrow. Thanks.
I did sort of get it working with washers taped to brake pedal arm, I have to pull it up about a millimetre to get it working. So was going to add a thin washer tomorrow anyway.
But will try your suggestion for sure.

Gerd · Post by **Gerd** » 21 Sep 2020, 21:32

I see what you mean but I can't see where the switch should lock into the bracket. If I push it fwd, as soon as I release the brake pedal, it slides backwards to the point the cruise won't come on. I think I just need to find a good image ofit or technical drawing of where it locks in as I am a little too big to be twisted up under there for very long.

Post by **RickHaleParker** » 22 Sep 2020, 21:44

Gerd wrote: ↑21 Sep 2020, 21:32 I am a little too big to be twisted up under there for very long.

That is what kids are for.

I'm pretty sure it just pushes into a hole and clips in place. Most likely the clips broke off.

That being a a 1998 ... I think it is a pneumatic valve rather then a electrical switch.

Pull the part out and take a look. Get the part number off of it.

Should be Volvo part number 9146505.

Gerd · Post by **Gerd** » 23 Sep 2020, 05:32

Yup. Saw this on FCP a few days ago. I think you are right about clips as it moves fwd and back fairly easy. The plunger has a ratchet inside of it but the problem seems to be the housing not locking in place. Anyway, I just need to free up 5-10 min to takes some pics under there and assess what the fix is.
I'll let you know.

Cheers