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Old    Chris Bolding (chris_b)      Join Date: Feb 2007       12-03-2009, 5:04 PM Reply   
What would cause my trailer to jerk so dang bad when i take off? This is my second inboard, and did not have the tongue slip this bad on my Moomba. This is a Malibu but both were Boatmate trailers.
Old    TigeMike (chpthril)      Join Date: Oct 2007       12-03-2009, 5:28 PM Reply   
Low fluid level and/or air in the lines would be my first thing to check.
Old    Flux (flux)      Join Date: Jun 2003       12-03-2009, 5:52 PM Reply   
The shock absorber inside the assembly should be the second.
Old    Moe (nauti4life)      Join Date: Sep 2008       12-03-2009, 5:52 PM Reply   
bad master cylinder and or shock.
Old    Chris (rio_sanger)      Join Date: Apr 2007       12-03-2009, 6:07 PM Reply   
HA! I read the post title, I thought it was about the guys that tow in the left lane.
Old    Bill K (bill_airjunky)      Join Date: Apr 2002       12-03-2009, 6:35 PM Reply   
Every trailer I've ever had that had surge brakes did this to some degree after a stop that required some brakes. The jerk is the actuator pulling back out on the master cylinder.
Old                12-03-2009, 6:40 PM Reply   
50 bucks says it's a wheel cylinder.
Old    Kraig Kaiser (kraig)      Join Date: Dec 2002       12-03-2009, 10:36 PM Reply   
I bet it's just normal. How much did your Moomba weigh? And how much does your Malibu weigh? This affects how much the actuator pushes in. I never noticed it on my first boat, weighed roughly 3000lbs. My current trailer has the jerk he's talking about with a boat weighing about 4200+lbs.
Old    Newty (newty)      Join Date: May 2005       12-03-2009, 11:18 PM Reply   
My money is on low or no brake fluid.
or... bad shock.
Old    Bu Coo (brett564)      Join Date: Jul 2006       12-04-2009, 3:13 AM Reply   
Brake Fluid. That's when I know to fill it back up.
Old    Matt (mattscraft)      Join Date: May 2009       12-04-2009, 7:17 AM Reply   
They all will jerk a bit, has to, as the actuator slides out. Angle of the trailer will have a big effect too high or low; make sure you are level, after you check the obvious fluid etc. After stopping, I just ease on the gas a bit to pull the actuator out softly before jumping on the gas.
What is your total weight compared to your vehicle tow rating, if you are very close this will also affect how much jerk you are feeling on takeoff. i.e. 5000lbs rating, 5000lbs total weight. I used to tow a total weight Cobalt with a Jeep Grand Cherokee, 5000lb rating, 5100 lbs boat and trailer, angle was a bit low and you could really feel it jerk. I now have a Ram 1500, 6500 lb rating an 5500lb total weight MC, set up is perfectly level and you still feel a little, but a huge difference.
Only other way around it is to add one of those shock receivers!
Old    Tim (srock)      Join Date: Mar 2002       12-04-2009, 8:06 AM Reply   
How well do those shock receivers work?
Old    Joe (superairdawg)      Join Date: May 2003       12-04-2009, 8:18 AM Reply   
Sounds like the actuator might have too much travel which can either be air in the lines, or if you have drum brakes they may need adjusted a bit.

A bad dampening shock could be the culprit, as well.
Old    Dylan Callahan (jumpit13)      Join Date: Oct 2006       12-04-2009, 8:03 PM Reply   
if the fluid is low, and you don't have any leaks, check the pads if worn out replace them first and then check the fluid. but just my 2 cents.
Old    Chris Bolding (chris_b)      Join Date: Feb 2007       12-04-2009, 9:02 PM Reply   
well I checked today and the fluid is very low. I will add some and see how it does Sunday when I pull it home for a good winter cleaning. I just got this boat late September so it is still new to me. I am going through replacing things so I know what I have.
Old    Topsidemarine (topside_marine)      Join Date: Sep 2005       12-05-2009, 12:58 PM Reply   
Chris,

What you describe sounds like a master cylinder that is not functioning as designed for what ever reason. When you look inside the master cylinder is is rusty or very dirty or is it clean and shiny like new metal. Also just adding fluid may not solve the problem. I expect at a minimum adding fluid and then bleeding the excess air from the lines may be your answer but if not you also may be looking at replacing the brake system to fix the problem. Good luck.
Old    Brady (pdxWAKE.com) (big_b_21v)      Join Date: Oct 2006       12-05-2009, 2:20 PM Reply   
Hey Chris what year is the trailer?
I had the same problem on my 2006 Boatmate Trailer for my Supra. I could never get it fixed but heard through one of the service guys that they had a run of trailers with a bad cylinder or too short of cylinder, something like that.
I could never get anyone to warranty it. It was never a problem other than being annoying, but I would imagine that over time that jerk when you take off cant be good for the welds on the trailer.

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