First depress of clutch pedal is stiff - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

 3Likes
  • 1 Post By blktaz
  • 1 Post By RoboRob
  • 1 Post By blktaz
 
LinkBack Thread Tools
#1 Old 06-29-2015
Registered Users
 
blktaz's Avatar
 
Join Date: May 2014
Location: South Gloucestershire
Vehicle: R170 200 6-speed manual 2002
Posts: 51
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 3
Thanked 13 Times in 8 Posts
(Thread Starter)
First depress of clutch pedal is stiff

Every time I start the car up from cold the first depression of the clutch is hard, and then it goes light and feels absolutely fine.

In the past I've changed over the oil and I've bleed the clutch, which btw made a huge difference in the pedal feel; changing out the dirty dot 4, it turned the clutch from what felt like a brake pedal to a very smooth linear feel (I recommend this for any manual drivers out there).

From what I can remember before I'd changed the fluids (4/5 months ago) I still had a very hard initial depress of the clutch, so I know it's not something I've done.

The car drives fine as I said, it's only the first depress, it shifts really nice at high and low revs, before the oil and dot 4 change it felt jerky shifting at high rpms and you had to buff out your left leg to even shift that quickly.

Can anyone tell me why this is happening? My guess is something to do with engine vacuum from cold start.
blktaz is offline  
Sponsored Links
Advertisement
 
#2 Old 06-29-2015
Registered Users
 
Join Date: Jan 2015
Location: MA
Vehicle: 2001 SLK320
Posts: 150
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Thanks: 0
Thanked 17 Times in 16 Posts
Garage
I also experience this (my post a week or two ago - "slow at the start but give it some time"). I have not recieved any explanation. I figure the fluids need to warm up. Engine needs to be about 60 degrees F until the car drives normal.
Joeb77 is offline  
#3 Old 06-29-2015
Registered Users
 
Erok's Avatar
 
Join Date: Aug 2007
Location: Alexandria, VA
Vehicle: 2003 SLK230 6-Speed Manual
Other Toys: 2013 ML350, 2007 SLK280
Posts: 137
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Thanks: 3
Thanked 8 Times in 7 Posts
I had this problem and in the winter time the clutch would stick and 1-2 seconds before releasing. I had my mechanic flush the clutch fluid and refill it. It uses the same fluid as your brakes. My clutch is now very springy and all is well. I only paid $60 to have this done.

I was there when it was drained and the fluid was a bit sludgy.
Erok is offline  
 
#4 Old 07-01-2015
Registered Users
 
blktaz's Avatar
 
Join Date: May 2014
Location: South Gloucestershire
Vehicle: R170 200 6-speed manual 2002
Posts: 51
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 3
Thanked 13 Times in 8 Posts
(Thread Starter)
I'm surprised you guys have manuals over the water, thought the majority would have been autos :P

I got under the car and bleed the clutch myself with the help of an extra pair of hands to pump the pedal and yes, sludge like substance came out and the difference was night and day when shifting, made the car more enjoyable to drive ten fold.

This is definitely something you can do yourself with a pair of axle stands, 500ml coke bottle and half a metre of either aquarium tubing or similar and of course some new fluid.

I went for a drive yesterday and the first depress was not as stiff as it usually is from cold, difference being it was a really hot day yesterday in England, or at least in Dorset, so possibly it is heat related.
blktaz is offline  
#5 Old 07-01-2015
Registered Users

 
ichris93's Avatar
 
Join Date: Dec 2014
Location: Ann Arbor, MI
Vehicle: 05 C240; Sold-2001 SLK 230 6 Speed
Posts: 469
Country:
Chats: 0
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 89 Post(s)
Thanks: 64
Thanked 62 Times in 48 Posts
Quote:
Originally Posted by blktaz View Post
I'm surprised you guys have manuals over the water, thought the majority would have been autos :P

I got under the car and bleed the clutch myself with the help of an extra pair of hands to pump the pedal and yes, sludge like substance came out and the difference was night and day when shifting, made the car more enjoyable to drive ten fold.

This is definitely something you can do yourself with a pair of axle stands, 500ml coke bottle and half a metre of either aquarium tubing or similar and of course some new fluid.

I went for a drive yesterday and the first depress was not as stiff as it usually is from cold, difference being it was a really hot day yesterday in England, or at least in Dorset, so possibly it is heat related.
I just got my 6 speed on Monday and am doing some maintenance things since I do not know the last time they were done. I want to flush the brake and clutch fluid. Is the reservoir for the brakes the same and only one for the clutch?
ichris93 is offline  
#6 Old 07-01-2015
Registered Users
 
blktaz's Avatar
 
Join Date: May 2014
Location: South Gloucestershire
Vehicle: R170 200 6-speed manual 2002
Posts: 51
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 3
Thanked 13 Times in 8 Posts
(Thread Starter)
Quote:
Originally Posted by ichris93 View Post
I just got my 6 speed on Monday and am doing some maintenance things since I do not know the last time they were done. I want to flush the brake and clutch fluid. Is the reservoir for the brakes the same and only one for the clutch?
They share the same reservoir, although if you look inside after taking the mesh plug out, you'll see there is a divider wall (facing nearest the engine) and that's the clutch "side". The main and bigger area of the reservoir is for the brakes.
El_Toro_33809 likes this.
blktaz is offline  
The Following User Says Thank You to blktaz For This Useful Post:
#7 Old 07-01-2015
Registered Users
 
Erok's Avatar
 
Join Date: Aug 2007
Location: Alexandria, VA
Vehicle: 2003 SLK230 6-Speed Manual
Other Toys: 2013 ML350, 2007 SLK280
Posts: 137
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Thanks: 3
Thanked 8 Times in 7 Posts
Quote:
Originally Posted by blktaz View Post
I'm surprised you guys have manuals over the water, thought the majority would have been autos :P

I got under the car and bleed the clutch myself with the help of an extra pair of hands to pump the pedal and yes, sludge like substance came out and the difference was night and day when shifting, made the car more enjoyable to drive ten fold.

This is definitely something you can do yourself with a pair of axle stands, 500ml coke bottle and half a metre of either aquarium tubing or similar and of course some new fluid.

I went for a drive yesterday and the first depress was not as stiff as it usually is from cold, difference being it was a really hot day yesterday in England, or at least in Dorset, so possibly it is heat related.
Isn't the clutch reaction amazing after bleeding out that sludge? My leg no longer gets sore from driving in heavy traffic. It took a day to get used to the rejuvenated clutch. .I kept slamming the pedal into the floor board.
Erok is offline  
#8 Old 07-01-2015
Registered Users
 
blktaz's Avatar
 
Join Date: May 2014
Location: South Gloucestershire
Vehicle: R170 200 6-speed manual 2002
Posts: 51
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 3
Thanked 13 Times in 8 Posts
(Thread Starter)
Quote:
Originally Posted by Erok View Post
Isn't the clutch reaction amazing after bleeding out that sludge? My leg no longer gets sore from driving in heavy traffic. It took a day to get used to the rejuvenated clutch. .I kept slamming the pedal into the floor board.
Yeah, the most noticeable change is in traffic, it was like getting used to a completely different clutch in another car. Shame then that the manual boxes are pretty clunky, even when warm but I still wouldn't have an auto on a 170. I've driven both a 171 and 172 auto and enjoyed them, but I love my slk and it's a style of driving you get used to, double de clutching helps a lot
blktaz is offline  
#9 Old 07-01-2015
Registered Users
 
RoboRob's Avatar
 
Join Date: Jun 2013
Location: Vancouver, BC
Vehicle: 2002 SLK320 6 speed
Posts: 159
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Thanks: 8
Thanked 11 Times in 10 Posts
Thanks Guys, this is the kind of info I've been looking for. Hardly any info to be found on a R170 manual transmission.

Anyone know of any write-ups on changing the transmission fluid, or the clutch pedal fluid (although, by the sounds of it, the clutch pedal fluid is easy). Also, seeing that the clutch and brake fluids share the same reservoir, would the clutch fluid not be considered "changed" when a brake fluid change is done?

Thanks,
Rob
Khoanigsegg likes this.
RoboRob is offline  
#10 Old 07-02-2015
Registered Users
 
blktaz's Avatar
 
Join Date: May 2014
Location: South Gloucestershire
Vehicle: R170 200 6-speed manual 2002
Posts: 51
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 3
Thanked 13 Times in 8 Posts
(Thread Starter)
Quote:
Originally Posted by RoboRob View Post
Thanks Guys, this is the kind of info I've been looking for. Hardly any info to be found on a R170 manual transmission.

Anyone know of any write-ups on changing the transmission fluid, or the clutch pedal fluid (although, by the sounds of it, the clutch pedal fluid is easy). Also, seeing that the clutch and brake fluids share the same reservoir, would the clutch fluid not be considered "changed" when a brake fluid change is done?

Thanks,
Rob
This thread I created talks about the correct amount of oil that should be inside a manual trans, lots of nay sayers who hadn't done the research I had, and the end result was finding documentation on lowering the original amount from 1.5l to 1.2l. check out the link in the last post from me. It seems to be a general opinion filling the oil until it spills out the fill hole is the right way, not on an r170!

As for a guide on changing the oil, well there's not an easy way unless you have a ramp due to the position of the fill hole. I used a 100ml syringe and filled it up that way, took a long time and effort but it's accurate.

No, if you bleed the brakes that won't affect the clutch as in a my post above mentions; the divider wall inside the reservoir separates the clutch from the brake fluid and also you need to flush new fluid through the clutch lines by getting under the car/transmission, which you woundn't have done if you only bleed the brakes.

I'd remove the current fluid from the reservoir completely with a syringe, and fill up to the top with new fluid (not the max marker, the actual top) and begin bleeding the brakes and the clutch, this way you're not potentially pulling more grit and such through the lines, although the fluid will be black when you bleed it, keep topping up the reservoir to avoid pulling air through the system, and once it flows out of the brake/clutch nipple the colour it should be, you're good to go!
ichris93 likes this.
blktaz is offline  
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now



In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Creaky clutch pedal jfpslk SLK R171 General Discussion 4 08-25-2014 06:23 AM
2003 SLK230 Manual - Stiff Clutch Erok SLK R170 General Discussion 8 02-20-2014 09:35 AM
Stiff Throttle Pedal ? Naffdave SLK R170 General Discussion 3 02-19-2013 11:45 AM
Clutch stiff when cold Finalcut SLK R171 General Discussion 3 03-06-2007 08:53 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.